### BREAKING CHANGES

* Actually removed the `invoke` symbol and `*` sigil that were supposed to be removed in v0.44.0 but didn't.
* Removed Dockerfile and Notepad++ highlighter (no longer maintained).
* When defining or deleting a sigil, a symbol with the same name is now defined/deleted as well.
* Removed obsolete aliases `io.read` and `io.write`.

### Fixes and Improvements

* Implemented `define-sigil` (was documented but not actually implemented).
* Reviewed documentation making sure that documented operators match with implementation.
* The `help` symbol now correctly displays help for namespaced symbols.
* Enhanced the `tokenizer` symbol to provide additional information for symbols.
* Enhanced min shell highlighting to support dot notation, sigils, autopop, global symbols.
* Enhanced Vim syntax file (`min.vim`) to support latest constructs.