Improved game tags and aliases

[Solaire]

Each game should be able to support N number of tags and aliases.

An alias is:

• A short identifier to manipulate the game (launch, uninstall, toggle favourite, etc) from the command-line args or insert mode
• Unique to the game

A tag is:

• A keyword which groups multiple games together
• Allows the app to display games with similar tags in a single folder

This extension of the existing functionality should probably be implemented after the database implementation is done (otherwise it would have to be implemented twice)

[Nutzzz]

One idea I had was if shortcuts are put in a subfolder of customGames, they could automatically inherit the subfolder name as a tag.