Abstract out extending closure environments in prep. for macro implementation
Fix readline column positioning when using colors
Rewrite special-forms handling - prep for macros
Fix colors so that identity works with kwargs
Add iterative Repr class to efficiently traverse nested structures (i.e. without blowing the stack)
Ignores
Removed unused code
Merge branch 'feature/macros' of github.com:rm-hull/yalix into develop

* 'feature/macros' of github.com:rm-hull/yalix:
  Removed unused code
  Ignores
  Add iterative Repr class to efficiently traverse nested structures (i.e. without blowing the stack)
  Fix colors so that identity works with kwargs
  Rewrite special-forms handling - prep for macros
  Fix readline column positioning when using colors
  Abstract out extending closure environments in prep. for macro implementation