Refactor

[benblack86]

Hopefully a minor PR.

• I noticed that some protocol types used the letter C, whilst other places used P. I refactor so P is consistently used.
• Removed some unused imports
• Made the lift implementations more explicit

[codecov-io]

Codecov Report

Merging #536 into master will decrease coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
- Coverage   84.74%   84.71%   -0.03%     
==========================================
  Files          98       98              
  Lines        4293     4293              
  Branches      331      331              
==========================================
- Hits         3638     3637       -1     
- Misses        655      656       +1

Impacted Files	Coverage Δ
...main/scala/colossus/protocols/redis/RedisOps.scala	95% <ø> (ø)	:arrow_up:
...c/main/scala/colossus/service/RequestHandler.scala	88.88% <ø> (ø)	:arrow_up:
...ain/scala/colossus/protocols/http/HttpClient.scala	90% <ø> (ø)	:arrow_up:
...cala/colossus/protocols/memcache/MemcacheOps.scala	80.55% <ø> (ø)	:arrow_up:
...lossus/src/main/scala/colossus/service/Async.scala	50% <ø> (ø)	:arrow_up:
...in/scala/colossus/service/AsyncServiceClient.scala	100% <100%> (ø)	:arrow_up:
...s/src/main/scala/colossus/service/ServiceDSL.scala	83.33% <100%> (ø)	:arrow_up:
...s/src/main/scala/colossus/core/server/Server.scala	95.62% <100%> (ø)	:arrow_up:
.../scala/colossus/metrics/collectors/Histogram.scala	91.91% <0%> (-0.74%)	:arrow_down:

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[amotamed]

👍