Added language_helpers plugin system. Language helpers allow preprocessing of archives before sending them to a target. Right now we use this to scan for local includes.
Added O2 optimizations. This was at O0 before.
Added language_helpers to standard kiss environment
Integrated language helpers into download system
Renamed C_lexer to c_lexer to match rest of lexer names
Fixed kovan_proto_target to work with new libkovanserial return values