Obvious missing features

[Johan-Mi]

• [x] if
• [x] if-else
• [x] else-if
• [x] loops
• [x] lists
• [x] mutable variables
• [x] global variables
• [x] broadcasts
• [ ] various blocks
• [ ] aggregate types
  • [x] Parsing
  • [x] Name resolution
  • [ ] Field access
  • [x] Constructors
  • [x] HIR
  • [x] THIR
  • [ ] MIR
• [x] imports
  • [x] Should use relative paths
  • [x] and be sandboxed with Path::starts_with.
• [x] Tree-sitter grammar
• [ ] the ability to share variables between files
  • Can be worked around with getters and setters.
• [x] early returns
  • How do we make this work with inlining?