Enhancement: Let grunt generate tmLanguage folder

[Centril]

Let grunt autogenerate tmLanguage folder

Motivation: the tmLanguage folder contains a list of dummy *.tmLanguage files which enable us to display icons for some non-languages that have distinct file types that sublime text doesn't recognize. These files are very repeatable and should therefore be autogenerated.

Where to store: As languages.json already contains data about icons, the information needed should be stored there in a different property.

Assign to?: Myself.

Also:

Benefits: This will allow us to more easily display some icons for people who for example do not have Gradle installed, and other missing languages from sublime text as default.
As part of resolving this issue, displaying icons for those relevant languages should be resolved and fixed. The icons in question are already there - it's just a matter of displaying them.

[lefoy]

This would be a welcome addition. Thanks!