feat: Improved type parsing

[Zffu]

Changelog:

• Improved type parsing to allow for size specifications for number types (Arbitrary size numerical types #30 by @shishioko, Variable size fixed point numbers #31 by @shishioko)

  Example syntax:

  var x.5.5 = 5; // Defines a signed fixed point integer with 5 * 2 bits!
  

• Improved type parsing to allow for type specifiers

  Example syntax:

  var test<myType> theee;