Core: Implement automatic symbol demangling

A few actions were missing from shortcuts in the Tools menu. This allows using e.g. `ALT`+(`T`>`E`>`S`) to open the Skylanders Manager, or `ALT`+(`C`>`C`>`1`) to toggle the first Wii Remote's connection.

Add page table fastmem to Debug/JIT settings

This can be useful for experimenting with how a game behaves with and
without page table fastmem. As with everything in the JIT menu, this is
only available if Dolphin's debugger is enabled.

I didn't add this in 989a95a when I added the setting itself because we
were under a string freeze for Dolphin 2603a at the time.

Accomplished using `run-clang-tidy` with `performance-move-const-arg,performance-unnecessary-value-param,modernize-pass-by-value`.

Changed arguments to const references, removed them where inappropriate (e.g. sink parameters). Same with std::move.

Manually reviewed each change to make sure that it makes sense, and do something more appropriate if possible.

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...)