Apply some quick updates

[WaitingIdly]

changes in this PR:

• rename "New Test" to "Semi-Transparent" (port of Change the theme name from "New Test" to "Semi-Transparent" GTNewHorizons/BetterQuesting#177).
• when loading from the new quest format, skip non .json files (related to fix loading quests with unrelated files present in quests config GTNewHorizons/BetterQuesting#184).
• add a button to copy the quest description (port of Add copy quest description button GTNewHorizons/BetterQuesting#181) - slight difference in that it copies it with formatting codes when clicked, and strips formatting codes when holding shift (indicated via tooltip).
• add argument to command, allowing /bq_admin complete all [player] (port of Add Complete All Quests Command GTNewHorizons/BetterQuesting#186).
• improve highlight method by focusing and zooming on it + flashing color more frequently and severely (port of Make searched quests more noticeable GTNewHorizons/BetterQuesting#134) - slight difference in that it flashes faster and doesn't become pitch black.
• remove unused registration of event bus (port of Remove unnecessary event registration GTNewHorizons/BetterQuesting#163). a bit weirder here, since it does register(new LootRegistry()), but everything uses LootRegistry.INSTANCE.
• fixes for the back keybind:
  • make it only indicate incompatibility with GUIs, not UNIVERSAL.
  • fix the back keybind not working for mouse buttons.
  • add config to prevent going back when the parent screen is the home screen (default: false) (feature of the back keybind for BQu:T)
• make some changes to the external editor:
  • add a config for if it automatically appears (default: true) - theres always a button on the top right of the GUI that opens it regardless.
  • make the logic more abstract, and use it to allow editing the questline descriptions too.
• fix the "edit questline description" button always being clickable, even if no questline was selected.

resolves #78, resolves #121.
originally intended to just port several GTNH fixes, but then forgot that was the point and made some other changes.

[Rongmario]

Just a few minor changes proposed, not necessary, assuming all the PRs have been checked in NH anyway.