Ease version handling and folder layout

[berndgassmann]

• Handle version by cmake/carla-map-version.cmake
• Replace generated cmake files
• Remove impl folder
• Update version number to 2.5.0

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This change is 

[codecov-commenter]

Codecov Report

Merging #71 (ba03c30) into master (5efb33f) will decrease coverage by 5.16%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
- Coverage   67.52%   62.35%   -5.17%     
==========================================
  Files         380      704     +324     
  Lines       12354    42132   +29778     
  Branches     4936    16592   +11656     
==========================================
+ Hits         8342    26273   +17931     
- Misses        884     1351     +467     
- Partials     3128    14508   +11380     

Impacted Files	Coverage Δ
ad_map_access/impl/src/match/AdMapMatching.cpp
...l/include/ad/map/point/BoundingSphereOperation.hpp
ad_map_access/impl/src/route/Planning.cpp
.../impl/include/ad/map/intersection/Intersection.hpp
...l/include/ad/map/intersection/CoreIntersection.hpp
..._map_access/impl/src/intersection/Intersection.cpp
...p_access/impl/src/opendrive/DataTypeConversion.cpp
..._access/impl/include/ad/map/point/GeoOperation.hpp
ad_map_access/impl/include/ad/map/route/Route.hpp
...ccess/impl/include/ad/map/point/PointOperation.hpp
... and 430 more

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