Add new compound and modulo operators to E2

[CornerPin]

Initially I just wanted to add %= as I found it odd that Expression 2 doesn't already have it, then I thought why not also add compound bitwise operators for completeness. Also added modular arithmetic operators for more types.

To summarize, this PR:

• adds %=, &&=, ||=, ^^=, >>=, and <<= compound assignment operators
• adds modular arithmetic operators to vector2, vector, vector4, angle, complex, and quaternion:
  • number % vector2
  • vector2 % number
  • vector2 % vector2
  • number % vector
  • vector % number
  • vector % vector
  • number % vector4
  • vector4 % number
  • vector4 % vector4
  • number % angle
  • angle % number
  • angle % angle
  • complex % number
  • quaternion % number
• renames NodeVariant.CompoundArithmetic to NodeVariant.CompoundAssignment
• adds tests for the new operators.