Export type `Level` to externally work with levels that are passed to the `setHeading` and `toggleHeading` commands, instead of only being able to pass literal numbers.
Example:
```
// where `selectedHeadingLevel` changes as part of other logic
this.editor.commands.toggleHeading({ level: this.selectedHeadingLevel })
```
Co-authored-by: Britta Weiland <weiland@bryter.io>
* add new addOptions option
* replace defaultOptions with addOptions for all extensions
* replace defaultOptions with addOptions for all demos
* replace defaultOptions with addOptions in docs
* refactoring
* refactoring
* drop object support for addOptions
* fix optional options
* fix tests
* refactoring
* improve link regex
* WIP: add new markPasteRule und linkify to image mark
* move copy of inputrule to core
* trigger codeblock inputrule on enter
* refactoring
* add regex match to markpasterulematch
* refactoring
* improve link regex
* WIP: add new markPasteRule und linkify to image mark
* move copy of inputrule to core
* trigger codeblock inputrule on enter
* refactoring
* add regex match to markpasterulematch
* update linkify
* wip
* wip
* log
* wip
* remove debug code
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* rename matcher
* add data to ExtendedRegExpMatchArray
* remove logging
* add code option to marks, prevent inputrules in code mark
* remove link regex
* fix codeblock inputrule on enter
* refactoring
* refactoring
* refactoring
* refactoring
* fix position bug
* add test
* export InputRule and PasteRule
* clean up link demo
* fix types