Impliment class Enums

[rdlaitila]

Look into implementing a new class member type 'enum'. Possible usage:

enum : Color {
    RED,
    BLUE,
    GREEN,
}

Also allow enums with specific values:

enum : Color {
    RED = 1,
    BLUE = 2, 
    GREEN = 3
}

Enums are always public and can be accessed even if the class is not permitted to have a static class instance:

print(MyClass.Color.RED)
print(MyClass.Color.BLUE)
print(MyClass.Color.GREEN)