Added edit menu to games tab, fixed missing game assets

[dammitjeff]

• Added edit menu to games tab. Games can be deleted from the database, removing the link to the corresponding video clips. Planning to bring this menu to the "my videos" tab as well, so we can bulk tag a bunch of videos to a specific game.

• Added a fallback for missing game assets. If the game assets for a game cannot be loaded, it will pull from SteamGridDB and re-download the assets into their corresponding folder automatically upon loading.
• Minor bugs and code cleanup.

[dammitjeff]

Had a thought and realized we can re-use the menu bar components and add them in the Games tab!

We also now have the ability to tag games in bulk with this option. Selecting clips and pressing "link to game" will open a menu where you can assign the clips to a game.

If the game is not in your database, you can add it right then and there to your database and link the game instantly!

I think we're REALLY starting to form a pretty decent categorization system here, this should hold us off at least until we can have some more time to work on the "auto-match game" feature. :)

[ShaneIsrael]

Awesome, this looks great. I may make some minor UI adjustments or wording updates in the future but overall I think this looks good. Being able to multi select and add was a good idea.

[dammitjeff]

Thank you! Yeah totally change whatever you want, just happy we have the framework laid out for this :) Excited to see this in main release!

[ShaneIsrael]

@dammitjeff yep, should be available in v1.3.3 as an initial release here within the next 30 minutes or so. Thank you for the awesome addition, I'll definitely be using it and I'm sure others will as well.