Use `sizeHint` instead of `setMinimumSize` to increase the default size
of `StickWidget` and `IRWidget`.

0531286906ec65edf3736813517496c95bf87ada doubled the initial sizes of
`StickWidget` and `IRWidget`, but using `setMinimumSize` to do so
prevented users from shrinking the widgets manually.

Resolves bugs.dolphin-emu.org/issues/14019.

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

This apparently didn't compile on macOS six years ago before c++20, but
it should be fine by now.

While I'm at it, make the constants upper case per convention.

This lets the TAS input code use a higher-level interface for
overriding inputs instead of having to fiddle with raw bits.
WiiTASInputWindow in particular was messy with how much
controller code it had to re-implement.

SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.

- Use the Dolphin Icon in TAS Windows
- Prevent deformation of the stick widget (#11988)
- Improve visual appearance
- Set a reasonable minimum size

Qt/TAS: Enable antialiasing for Stick/IR widgets