Allow Users to select any card as a commander

[Elonex777]

Like #50 Should have something that convey they are not official: like a sticker and be able to toggle it on/off on the settings (would be useful for printing purpose)

Alignments Values of the most obvious one:

• Banned
• Extra Silver Border
• Heroes of the Realm
• Nephilims, maelstrom angel, Genju of the Realm, Budoka Gardener, Elbrus, the Binding Blade, Tamanoa, Ankle Shanker, Westvale Abbey

[Elonex777]

Lithl comment on the security:

If the user enters a custom choice for a commander, then we have two options: the client queries Scryfall directly, or the client asks the server to query Scryfall. If the client queries Scryfall, then it's possible to perform a man-in-the-middle attack to inject malicious data into the program. (The structure of the program limits what malicious code could accomplish, but the potential is there.) If the server is asked to query Scryfall, then we are sending user input to the server, which always carries risk, period.
[08:02]
For example, the server already has code to prevent something like /images/../../../somerandomfile.txt which would access somerandomfile.txt on the server outside of the program root.