Removed StaticArray#new. To create one you need to specify the initial value of each element either via a single value or a block (similar to Array). Can still use "::" to declare on stack (more efficient but unsafe)

Renamed Pointer#memcpy and Pointer#memmove to copy_from and move_from. Also added copy_to and move_to.

Added Slice and use that in IO. For now there are no extra checks. Also: fixed some things in the compiler and added Enumerable#join(separator, io, &block)

Raise errors on more cases, like duplicated argument names, type var names, reopening a generic class with other type vars, etc.

Started implementing splats. Splat in def arguments are now working. Missing: combine them with default values and also allow splatting call arguments.