[feature] tags

[jrpie]

(requested by Sarp Küçük)

Please describe the problem to be solved

Some apps are not important enough to show them in all apps but it is also tedious to unhide them whenever they are needed.

Describe the solution you would suggest

Let users add tags to apps. For each tag:

• add an action to show a list of apps with this tag
• add an option to hide apps with this tag from all apps
• add an option to show this tag in the drawer (and also respect it when searching) (?)

Furthermore add an action to list all tags.

Describe alternative solutions you've considered

Make hidden apps more easily accessibile. However the main reason to add the hidden apps feature was that users wanted to hide preinstalled junk apps they never use. So this is not an option.

Additional info

This might unify the features "hidden apps" and "favorite apps", as hidden and favorite could be implemented as tags with special handling.