Improve player, character, game autocomplete

[joaorb64]

On:

• Player autocomplete
• Character autocomplete
• Game selection autocomplete
• Game selection autocomplete on the asset downloader

Basically make it work similarly to how vscode' Ctrl+P menu autocomplete works.

Example:

If I type "rob" I want these (made-up) options to show up:

• R. O. B. (r...o...b...)
• Robert (rob...)
• Daroby (...rob...)
• RedOnionBiscuit (r...o...b...)

For character and game, we can also make the search use their codenames.

Tip: ask chatgpt for initial help in the lines of "how to do an autocomplete like this in pyqt5"

[joaorb64]

Note: should use QTableView for the completer popup; add an extra column with a merged string, set it to hidden.