DolphinQt/FIFO/FifoAnalyzer: Use structured bindings

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...)

Requires at least GCC 11, Clang 13, MSVC 19.30 (VS2022 17.0), or AppleClang 13.1.6 (XCode 13.3).

When dragging the selection, the mismatch between signal
(itemSelectionChanged) and data consumed (currentRow) seemed to cause
the description to lag behind by one row.

FIFOPlayerWindow geometry fixes

Aside from allowing users to persistently set the window to their
desired size, this is also necessary to allow saving of the splitter
positions in FIFOAnalyzer to work correctly.

Core & UnitTests: Make overriding explicit and remove redundant virtual specifiers on overriding destructors

DolphinQt/FIFO/FIFOAnalyzer: Make parameters, arguments etc. constant