[UI/Fix] Categories improvements: make them composable, update style, fix combination with filters

[arielj]

This PR does a few different things related to the new Categories feature:

• Updated the style to match the new style used in Filters (this depends on that other PR)
• Made the categories composable, so we can show more than 1 category at a time
• Added the only action like we have in the filters, so we can easily filter by a single category
• Replaced the All categories "category" with a more clear Select all button now that they are toggles
• Fixed an issue when filters like Show hidden or Show Non-Available were ignored if showing a category
• Save the selected categories when changed and restore on boot (this was partially implemented before but was not working)

One thing that I did NOT implement intentionally is a way to add categories directly from the dropdown, we have to refactor how the categories creation is handled because it currently depends on adding the category for a given game. So to not make this PR bigger, for now I added a message that lets the user know they can add categories using the game menus instead of showing all / uncategorized.

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[flavioislima]

amazing stuff, looks a lot better now.
I think the next step (on another Pr though) would be to add a button to add new categories from the categories dropdown, then it will be perfect.