Use Lemire's fast check whether to escape a JSON string

[DennisOSRM]

Lemire explains the method in his recent blog post. Bottom line, it is faster.

Benchmark Results

Benchmark	Base	PR
alias	aliased u32: 1082.07 plain u32: 1082.28 aliased double: 952.881 plain double: 954.315	aliased u32: 1088.98 plain u32: 1156.68 aliased double: 948.964 plain double: 951.851
json-render	String: 6.65077ms Stringstream: 9.38816ms Vector: 6.83465ms	String: 6.62298ms Stringstream: 9.41552ms Vector: 6.93634ms
match_ch	Default radius: 4.41722ms/req at 82 coordinate 0.0538685ms/coordinate Radius 5m: 4.38879ms/req at 82 coordinate 0.0535219ms/coordinate Radius 10m: 14.9413ms/req at 82 coordinate 0.182211ms/coordinate Radius 15m: 36.589ms/req at 82 coordinate 0.446208ms/coordinate Radius 30m: 312.676ms/req at 82 coordinate 3.81312ms/coordinate	Default radius: 4.40638ms/req at 82 coordinate 0.0537364ms/coordinate Radius 5m: 4.39026ms/req at 82 coordinate 0.0535398ms/coordinate Radius 10m: 15.0229ms/req at 82 coordinate 0.183206ms/coordinate Radius 15m: 36.6518ms/req at 82 coordinate 0.446973ms/coordinate Radius 30m: 312.225ms/req at 82 coordinate 3.80763ms/coordinate
match_mld	Default radius: 2.77057ms/req at 82 coordinate 0.0337874ms/coordinate Radius 5m: 2.8208ms/req at 82 coordinate 0.0344ms/coordinate Radius 10m: 10.0691ms/req at 82 coordinate 0.122794ms/coordinate Radius 15m: 25.7561ms/req at 82 coordinate 0.314099ms/coordinate Radius 30m: 302.227ms/req at 82 coordinate 3.6857ms/coordinate	Default radius: 2.7439ms/req at 82 coordinate 0.0334622ms/coordinate Radius 5m: 2.73356ms/req at 82 coordinate 0.0333361ms/coordinate Radius 10m: 10.0565ms/req at 82 coordinate 0.12264ms/coordinate Radius 15m: 25.6863ms/req at 82 coordinate 0.313247ms/coordinate Radius 30m: 302.331ms/req at 82 coordinate 3.68697ms/coordinate
packedvector	random write: std::vector 9770.72 ms util::packed_vector 81846 ms slowdown: 8.37666 random read: std::vector 8409.35 ms util::packed_vector 33338.8 ms slowdown: 3.96449	random write: std::vector 9833.76 ms util::packed_vector 81878.2 ms slowdown: 8.32624 random read: std::vector 8461.8 ms util::packed_vector 33322.9 ms slowdown: 3.93804
route_ch	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 510.386ms 0.510386ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 351.149ms 0.351149ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 627.407ms 0.627407ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 151.105ms 0.151105ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 97.3492ms 0.0973492ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 146.415ms 0.146415ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 150.311ms 0.150311ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 96.8538ms 0.0968538ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 132.538ms 0.132538ms/req	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 511.762ms 0.511762ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 349.853ms 0.349853ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 643.417ms 0.643417ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 150.425ms 0.150425ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 96.5273ms 0.0965273ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 131.715ms 0.131715ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 150.649ms 0.150649ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 96.6212ms 0.0966212ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 131.529ms 0.131529ms/req
route_mld	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 635.801ms 0.635801ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 435.188ms 0.435188ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 809.095ms 0.809095ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 266.64ms 0.26664ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 161.2ms 0.1612ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 287.36ms 0.28736ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 264.154ms 0.264154ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 160.813ms 0.160813ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 286.529ms 0.286529ms/req	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 638.876ms 0.638876ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 435.419ms 0.435419ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 810.814ms 0.810814ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 262.779ms 0.262779ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 161.743ms 0.161743ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 286.937ms 0.286937ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 255.757ms 0.255757ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 159.964ms 0.159964ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 284.179ms 0.284179ms/req
rtree	1 result: 206.318ms -> 0.0206318 ms/query 10 results: 241.795ms -> 0.0241795 ms/query	1 result: 208.932ms -> 0.0208932 ms/query 10 results: 245.349ms -> 0.0245349 ms/query