Clean up.
# Improves the TBrookRequestMethod class.
# Uses raw data in Write[Ln](AJSON: [TJSONArray/TJSONObject]);.
+ Adds new constant: BROOK_HTTP_CLIENT_DEFAULT_LIBRARY.
Clean up.
+ Adds new enum: TBrookRequestMethod.rmUnknown.
+ Adds new functions: BrookRequestMethodToStr/BrookStrToRequestMethod.
Clean up.
+ Adds new tests: RequestMethodToStr/StrToRequestMethod.