Ground, but written in C this time

This repo houses the new Ground interpreter, which will replace the old C++ interpreter.

Features of this interpreter:

• Written in C instead of C++
• Somewhat organised and readable codebase
• Not super buggy (yet)
• Uses standard, portable C*

Now that Ground's features have mostly been finalised, this interpreter can be built with care to many features not initially planned, like functions and data structures

*so far, only tested on Linux, but hopefully should work on other platforms as well

Progress marker:

• Lexer
• Parser
  • Labels
  • Instructions
  • Values
  • References
• Interpreter
  • Labels
  • Console I/O
  • Control flow
  • Data
    • Variable creation
    • Variable access
    • Lists
      • Creation
      • Access
    • String operations
  • Maths
  • Comparisions
  • Type conversions
  • Functions
  • Custom data structures
  • Working with external libraries