Adding support for live preview

[MikhaD]

Obsidian live preview required the transition from codemirror 5 to codemirror 6. This meant obsidian had to change their API a bit. In order to get this working with the new API (the main issue was the auto select mode) I had to implement some of the functionality previously provided by code mirror from scratch. Below is a list of the major changes I made.

Changes

• Replaced the WordBoundries interface in core with EditorRange from the obsidian package

• Moves isUrl and isImgEmbed out of getReplaceText and into stand alone functions

• Added documentation for getReplaceText function

• Added documentation for NothingSelected enum

• Changed somethingSelected() check at the end of UrlIntoSelection to selectedText === "" because somethingSelected() was returning the wrong value when something was selected

• Added findWordAt function to mimic the functionality of the codemirror 5 editor.findWordAt function

• Changed some formatting to make the code a bit more readable

[denolehov]

Thank you very much! ❤️
I will make a release later today.

[MikhaD]

Awesome! I wasn't sure whether I should update the package.json version,manifest and change log. I did anyway so that you could potentially release it right away without any changes, but you may want to double check I did it to your standard before making a release.

[denolehov]

I use the semantic release to automatically update changelogs and add tags, but it's all good. I will make a release as soon as I have access to my workstation.

Thank you once again for your contribution and sorry for the lack of responsiveness from my side.

[lildude]

Whoopsie. Merging this without a corresponding release means the plugin is currently uninstallable - #36