Function Compiler

Adds support for integer macros in scoreboard players add|remove|set

Fixes bugs:

• Macros don't get parsed and compiled properly
• @n selector looks for players instead of entities

Adds selector argument: predicate

Adds commands:

• execute on origin
• execute on target
• execute store result storage ... float
• execute if predicate
• execute unless predicate

Adds /mcfc sub-commands:

• profiler
  • disable - Disables profiler
  • enable - Starts profiling (possibly recompiles code)
  • print_trace - Prints last trace results in console
  • print - Prints profiler results in console
  • reset - Resets current results
  • save_trace - Saves last trace results to disk (debug/ folder)
  • save - Saves profiler results to disk (debug/ folder)
• recompile - Recompiles all functions
• show_diagnostics - Shows all errors from compilation

Fixes bugs:

• execute positioned ^ ^ ^ works only when there's an entity in context
• Local coordinate math does not calculate the correct location
• execute unless score ... matches a..b generates an infinite loop