add ?tex command

[thxo]

Description

Adds ?tex (alias ?latex), LaTeX rendering using the rTex project.

Fixes #65

Merge concurrently with miaowware/qrm-resources#38

Type of change

• New feature

How has this been tested?

Manually tested using well-formed and invalid TeX expressions (examples).

Checklist

• Issue exists for PR
• Code reviewed by the author
• Code documented (comments or other documentation)
• Changes tested
• All tests pass (see DEVELOPING.md, if it exists)
• CHANGELOG.md updated if needed
• Informative commit messages
• Descriptive PR title

[classabbyamp]

oh yeah another thing, should there be an option to invert the output, so it's closer to discord's dark theme (i.e. #2C2F33 background and white text)? If so, it may work better as a second PR.

[thxo]

oh yeah another thing, should there be an option to invert the output, so it's closer to discord's dark theme (i.e. #2C2F33 background and white text)? If so, it may work better as a second PR.

I think the best way is probably to use something like PIL to invert the colors, instead of doing it in the LaTeX template, so that we could invert colors for borders in tables or tikz graphics as well.

Doing it in a second PR sounds good.

[classabbyamp]

hmmm with PIL it might not work well because of aliasing. Something to experiment with. #373