QC Updates

Updates mainly aiding transpilation, but also nice to have if sticking with DarkPlaces

• float -> int/bool
  • Helps the transpiler immensely
• Scope visibility reduction
• Replaces #define with const
  • More readable transpiler output (constant names instead of inline values)
• Replaces vector_[xyz] with vector.[xyz] (but not entity.vector_[xyz] because of a compiler bug)
• Removes -Wno-double-declaration
  • Required for compilation of transpiled source
• Removes useless uses of var, noref and local
• Uses #include instead of progs.src
  • Will help qc_physics

Squashed preview: 7239bacff8b7fb9fe9541d6c6dc852e78b5049ac