Thumb Icons For Voting, Linking Author Steam Profile In Workshop Flyout, Dealing With HL2 Mounting

[OrsellGit]

Originally, this branch was just for implementing the thumb icons I made to replace the old P2 low-quality icons or temporary text with higher-quality SVGs. These are semi-temporary as most if not all the icons we use need to be gone through and redesigned to fit the P2:CE style more.

In this branch, I also added the ability to view a workshop author's Steam profile by clicking their icon. Current position for this is also temporary, as some items in there, like the author name and maybe the addon description, need to be added.

I also took the liberty of fixing an issue with mounting with HL2 where because the episodes AppIDs are still considered not HL2's AppID (220) in the mount.kv file, so the check for HL2 and episodes doesn't properly work as it currently only checks for HL2's AppID. This is a temporary fix in case this needs to be pushed publicly before anything with the mounts.kv is fixed to accommodate this issue. P1 should also ideally be bundled with this problem since it uses the same statement and check function.

[OrsellGit]

So originally this wasn't the case when I started this, but now episodes are only recognized under HL2's AppID 220, even when HL2 isn't mounted. This throws a wrench into what I did and didn't catch this before because I was working with the original behavior when they were still separate. Now, the current behavior, even when episodes are mounted, the panorama will not recognize them as mounted. I will need to undo what I did or wait until internal behavior allows for a proper check.