* fixed wording in error message

* removed unimplemented builtins from identifiers

* `String`: fixed numerous problems where the string would no longer be zero terminated after edits

* Fixed `emplace-append-many` for `String` and `Array` using the wrong offset. (tests by Westerbly Snaydley)

* fixed crash when passing arguments in reverse into `va-range`

* added test case for callbacks

* implicit conversion for function pointer arguments passes unqualified type to `imply`

* console: fixed typo in `append-to-scope` that prevented binding variadics

* added default copy operator for `none`
* using `dupe` on plain, unviewed arguments generates no operator in the IL

* `range`, `rrange` verify that constant step sizes aren't negative or zero

* updated scopes to use clang+llvm 11

* added mention of discord channel to README.md

* added failing test (waiting for a fix from SPIRV-Cross)

#14: [PATCH] core: countof constant string is constant

* Rc: support for comparing refcounted values with not refcounted values of the same type

* hashing support for C enums

* `enum`: support for `copy`

* `Map`: `get` does no longer dereference

* removed debug print output

* `Map`: fixed `discard`