Prevent talonscript language files from being active in sleep mode

[AndreasArvidsson]

Adding mode: command to all talonscript language files to prevent them from being active in sleep mode.
fixes #561

The headers are getting quite verbose but right now I don't know of any better way to support both automatic language detection and forced languages that are only active in command mode.

EDIT:
One option if we are allowed pervert the applications context is to define an application for each language.
In code.py we could iterate the list of each language and define an application context for each of them.

for lang in extension_lang_map.values():
    mod.apps[f"lang_{lang}"] = f"""
    mode: command
    and mode: user.{lang}
    mode: command
    and mode: user.auto_lang
    and code.language: {lang}
    """

Then in talonscript just use this simple header

app: lang_python
-

@lunixbochs @knausj85 Is this a workable solution or should we stick to the verbose headers?

ps.
Just to clarify. The whole reason for the verbose header is that code.language doesn't update when forcing a language so until you switch file and code.language updates you have two active languages at the same time. Being able to force code.language to refresh would solve the issue in a better way I think.

[lunixbochs]

Please don't overload app: for this