Adds default ctor for TSymbol::TCompareFunctor

Issue: #39
Switch to a new radix tree by Yuuki Takano

Issue: #39
Fixes clang warnings about unused arguments of linker

Issue: #39
Merge branch 'feature/39/clang_support' into develop

* feature/39/clang_support:
  Fixes clang warnings about unused arguments of linker
  Switch to a new radix tree by Yuuki Takano
  Adds default ctor for TSymbol::TCompareFunctor

Issue: #39