Version 1.15

Lots of features! Anonymous classes, subprocess module, forward classes, and
anonymous blocks.

Gitlab's CI now builds a coverage report to the repo's pages. Development is now
done on main.

Equality ops now jump, coroutines put into `coroutine`, and builtin is now
called prelude. Enums now get a gc tag. Rewrote `List` and `String` methods with the help of extra warning flags added in v1.14.