The status bar shows the number of games in your collection. If any
games are hidden by the platform, region, or search filters it will also
show how many games are visible and how many are filtered.

The visibility of the status bar can be toggled from the menu by
selecting `View`->`Show Game Count`.

Implements https://bugs.dolphin-emu.org/issues/9517.

Yellow squiggly lines begone!
Done automatically on .cpp files through `run-clang-tidy`, with manual corrections to the mistakes.
If an import is directly used, but is technically unnecessary since it's recursively imported by something else, it is *not* removed.
The tool doesn't touch .h files, so I did some of them by hand while fixing errors due to old recursive imports.
Not everything is removed, but the cleanup should be substantial enough.
Because this done on Linux, code that isn't used on it is mostly untouched.
(Hopefully no open PR is depending on these imports...)

Since Grid View doesn't have a header for users to change sorting
options with, use List View's sorting in Grid View too.

Use NonAutodismissibleMenu for MenuBar's Options, JIT, and
Tools->"Connect Wii Remotes" menus, as well as for the Tags menu in
GameList's context menu.

NonAutodismissibleMenu allows users to check or uncheck multiple
checkable menu items without closing the menu between selections.

DolphinQT: Move variables to inner scope

Don't start a game when a double-click is triggered by a mouse button
other than the left button.

Fixes https://bugs.dolphin-emu.org/issues/12272.