Add TOML highlighting support

[LockeBirdsey]

Tried my best to add TOML support. Everything is there except for multiline string handling, i.e

bigString = """
this is a multi
line string
"""

After some investigation and experimentation, it seems that when doing multiple ''' or """ while also switching between two block states, it will just fail silently (at least I couldn't find where it stopped trying to render). The highlightStringLiteral function seems to clash but even disabling that in TOML mode, I sill encountered this issue.

[pbek]

Thank you very much! Seems to work nicely! 👍️

[pbek]

25.2.3

• The GDScript support in the note edit code block syntax highlighter was improved
  to support $NodePath and %UniqueNode constructs highlighted as literals
  (for #216, thank you, @DarienMC)
• Added TOML support to the note edit code block syntax highlighter
  (for #217, thank you, @DarienMC)

There now is a new release, could you please test it and report if it works for you?

[LockeBirdsey]

25.2.3

* The GDScript support in the note edit code block syntax highlighter was improved
  to support `$NodePath` and `%UniqueNode` constructs highlighted as literals
  (for [#216](https://github.com/pbek/qmarkdowntextedit/pull/216), thank you, @DarienMC)

* Added TOML support to the note edit code block syntax highlighter
  (for [#217](https://github.com/pbek/qmarkdowntextedit/pull/217), thank you, @DarienMC)

There now is a new release, could you please test it and report if it works for you?

Yep it works as intended!

[pbek]

Great, thank you for testing!

[DarienMC]

I noticed that I was mistakenly given credit for TOML support in the newest version release notes, when this was actually @LockeBirdsey who contributed. Is it possible to edit the typo? Thank you

[pbek]

Oh! Thank you for mentioning!