Improve E2 Constants

[Vurv78]

• Moved constant handling from tokenizer to compiler
• Constants can now be these types: array vector angle string number (rather than just number and string)
• Constants have descriptions in the E2Helper
• Constants have extension filled in the E2Helper
• Added _VECTOR_ORIGIN

E2Lib.registerConstant now takes a third optional parameter for the description of the constant for the E2Helper.

Note that arrays can only accept other vector/angle/string/number.

How it works

Basically

print(_VECTOR_ORIGIN)

Is the same as

print(vec(0, 0, 0))

This is also how it worked previously except it only accepted numbers and strings.

RFC

Any other constants to be added?

[thegrb93]

Can you run functions using the constants? What prevents _VECTOR_ORIGIN:setX(23)?

[Vurv78]

Can you run functions using the constants? What prevents _VECTOR_ORIGIN:setX(23)?

The constants desugar to creating the objects yourself, so they're practically C #defines. So you'd just be doing vec(0,0,0):setX(23) (although the set* functions don't actually mutate the object anyway)

[Denneisk]

Vec origin should be vec() for optimization reasons but I understand that's not how it works here.
_ANGLE_ORIGIN = ang(0, 0, 0)
_VECTOR_UP = vec(0, 0, 1)

[Vurv78]

Not sure about _ANGLE_ORIGIN as a name so I'm just going to add _VECTOR_UP for the time being, thanks