Added `@type` inside macros that refer to the current type (so we remove all other magic instance vars and only keep that one)

Fixed: was able to invoke a zero-args initialize in a subclass if an initialize was defined in a superclass

Added `cast` class method to integer and float types. Use C::SizeT.cast(...) and C::ModeT.cast(...) instead of num.to_sizet and num.to_modet. Changed Pointer#memcmp to return an integer instead of a bool (like in C). Also added `zero class method.

Make `$~` be `MatchData.last` and `$1` be `MatchData.last[1]`. Removed all references to those globals until the next next release.

A C type can be declared as `type Name = Value` in addition to `type Name : Value` (the later will be deprecated)

Fixed bug: two different methods were having the same manging (one with &block and another without it but with the same type)