Micha/tuple refactor

[WilstonOreo]

• Removed Color variant from Type and Value
• Type aliases for NamedTuples: Vec2, Vec3, Color
• assert_eq and type_of builtin functions
• Fixed missing type check for assignments
• Fixed error in md_tests when using "#" in string literals
• parameter_value! is now called parameter!, remove old unused parameter! macro
• All attributes go into a .meta property.

Things noticed:

• Type checking for parameters is broken, will fix.
• The attributes stuff can be extended and writing my_part#layer would be easy to implement, but I leave it for now.