Expand environment variables section.

[Caellian]

Add Java AWT to toolkits.
Add application specific variables section for accumulating all the PLZ_WAYLAND env flags.

[vaxerski]

nonreparenting and moz are automatically set by hl. Worth noting...

[Caellian]

nonreparenting and moz are automatically set by hl

I moved them to a separate section so users know they don't require setting. Let me know whether that's fine, should be removed altogether, or just a comment next to the items would've been better.

If the separate section is kept, I guess I'll go through sources to add any other variables that are configured - just the ones that interact with other programs (i.e. not set by all WMs)

[fufexan]

You may want to also add SDL_VIDEODRIVER=wayland, QT_QPA_PLATFORM=wayland and XDG_SESSION_TYPE=wayland.

[vaxerski]

already set also includes XDG_SESSION_TYPE and XDG_CURRENT_DESKTOP for sure.

[fufexan]

I didn't see them when grepping through the source, my bad.

[Caellian]

Not sure whether you want "already set" section to be included @vaxerski. If I add it, you'll have to keep it up to date so lmk. IDK whether env vars are something you add/change often so I don't want to unnecessarily pile onto to the maintenance burden.

[vaxerski]

they arent changed often