Relax restrictions on sideloaded game titles

Problem description

Right now, sideloaded game titles cannot contain several special characters:

https://github.com/Heroic-Games-Launcher/HeroicGamesLauncher/blob/ac0a8efc5f529a173608d8aca8ea42c3040fdc0e/src/frontend/screens/Library/components/InstallModal/SideloadDialog/index.tsx#L69

This is a bit surprising since non-sideloaded games don't have that restriction. For example, + is not allowed, even though my non-sideloaded copy of Cave Story+ is listed without issue.

Feature description

It would be nice to lift this restriction. The title can always be sanitized elsewhere as needed, like for folder names (or that could use the auto-generated app_name).

Alternatives

No response

Additional information

No response