Description

This pull-request adds missing CodeMirror and ACE editor modes to languages that aren't using them.

There were two additions I had to leave out:

1. Unix Assembly's CodeMirror mode
   This is an upstream issue that I'll probably submit a patch for. If all goes well, expect a follow-up to this PR with the following changes:
   UPDATE: Already fixed in codemirror/codemirror5@98e86d1a. However, I'll hold off on adding text/x-gas for the same reasons as those discussed in item 2 (release cycles and what-have-you).

   diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
   index 70c9fd3a..10edf36f 100644
   --- a/lib/linguist/languages.yml
   +++ b/lib/linguist/languages.yml
   @@ -7844,6 +7844,8 @@ Unix Assembly:
      - unix asm
      tm_scope: source.x86
      ace_mode: assembly_x86
   +  codemirror_mode: gas
   +  codemirror_mime_type: text/x-gas
      language_id: 120
    Uno:
      type: programming

2. Clue's ACE mode
   I've only omitted this because support for Clue was added very recently to the Ace project itself, and the odds are that Linguist will need to update whatever Ace editor version it uses before I can include the following addition too:

   diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
   index 66c4324c..39f044f6 100644
   --- a/lib/linguist/languages.yml
   +++ b/lib/linguist/languages.yml
   @@ -1241,7 +1241,7 @@ Clue:
      extensions:
      - ".clue"
      tm_scope: source.clue
   -  ace_mode: text
   +  ace_mode: clue
      language_id: 163763508
    CoNLL-U:
      type: data

(Checklist removed as it doesn't apply)