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.

Made Stick and IR Widgets bigger
Improved Stick and IR layouts to better utilize space
Made Stick and IR Widgets Scale at a fixed ratio when window is resized
Added Scrollbars to Stick and IR Widgets
Reduced Spinbox padding in dark style

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...)

The `QtUtils::AdjustSizeWithinScreen()` function now centers the
widget on their parent window after the widget's size is adjusted. This
is required in some desktop environments (generally on Linux systems) to
ensure that the just-resized widget remains aligned with its parent
window.

The creation of the **Cheats Manager** dialog is now deferred to first
show, as creating it within the main window's constructor prevents the
dialog from knowing the real position of its parent window, which is
only properly calculated on first show.

For the same reasons, the analytics prompt is now shown only when the
application is ready (i.e. when the main window has been shown).

| Before | After |
| ------ | ----- |
| <img width="1920" height="1080" alt="[Dolphin Emulator] Misplaced analytics prompt" title="[Dolphin Emulator] Misplaced analytics prompt" src="https://github.com/user-attachments/assets/c3e43b3b-cf79-4398-b531-7de6068c583e" /> | <img width="1920" height="1080" alt="[Dolphin Emulator] Centered analytics prompt" title="[Dolphin Emulator] Centered analytics prompt" src="https://github.com/user-attachments/assets/a10d06d9-7438-4032-b96c-dfcb48826349" /> |
| <img width="1920" height="1080" alt="[Dolphin Emulator] Misplaced Settings dialog" title="[Dolphin Emulator] Misplaced Settings dialog" src="https://github.com/user-attachments/assets/f35b10ee-4f07-48d4-86f9-2537ad5ca7ca" /> | <img width="1920" height="1080" alt="[Dolphin Emulator] Centered Settings dialog" title="[Dolphin Emulator] Centered Settings dialog" src="https://github.com/user-attachments/assets/33e37237-77a4-44f6-a0e2-b709f65b672b" /> |
| <img width="1920" height="1080" alt="[Dolphin Emulator] Misplaced Cheats Manager dialog" title="[Dolphin Emulator] Misplaced Cheats Manager dialog" src="https://github.com/user-attachments/assets/1fbd3836-5639-4d5a-b57e-e2e21f21c9db" /> | <img width="1920" height="1080" alt="[Dolphin Emulator] Centered Cheats Manager dialog" title="[Dolphin Emulator] Centered Cheats Manager dialog" src="https://github.com/user-attachments/assets/3f2b1b50-de16-49b7-bac4-c444c6cab0bc" /> |

QtUtils/ImageConverter: simplify

DolphinQt: Replace widespread SetQWidgetWindowDecorations calls with an event filter.

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