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.

BreakpointWidget: Fix drawing of icon when breakpoints are disabled

Fix incorrect scaling of the gap drawn inside enabled breakpoints in
BreakpointWidget when breakpoints are globally disabled and the font
size is changed from the default.

As the font size increased the gap would become larger and its center
would "migrate" downward and rightward until the gap stopped being
visible at all.

Additionally, at small font sizes integer truncation issues could result
in the gap being offset towards the top left.

- Debug font is now used in the widget.
- Row height is now determined by the character height of the current
  font.
- A `OnDebugFontChanged()` slot has been connected to properly update
  the widget on debug font changes.

| Before | After |
| --- | --- |
| <img alt="Breakpoints widget (before)" title="Breakpoints widget (before)" src="https://github.com/user-attachments/assets/fdde293a-b1fd-4a1d-85e2-e16bc859eb9e" /> | <img alt="Breakpoints widget (after)" title="Breakpoints widget (after)" src="https://github.com/user-attachments/assets/cf4f1d59-c235-429b-bcb1-cae36065e805" /> |

- Row height is no longer hardcoded to `24`; instead, the height is
  determined by the font height of the currently selected debug font.
- Header height has been reduced (a factor of the font height) as it
  only serves as a column resizer.
- A `OnDebugFontChanged()` slot has been connected to properly update
  the widget on debug font changes.

| Before | After |
| --- | --- |
| <img alt="Registers widget (before)" title="Registers widget (before)" src="https://github.com/user-attachments/assets/8a6644f9-1081-4ac8-9fff-c79ddb73e103" /> | <img alt="Registers widget (after)" title="Registers widget (after)" src="https://github.com/user-attachments/assets/67f799d0-8afd-4081-bb40-3d7a76ddc705" /> |

This makes JitBaseBlockCache::ErasePhysicalRange around 50% faster and
PPCAnalyzer::Analyze around 40% faster. Rogue Squadron 2's notoriously
laggy action of switching to and from cockpit view is made something
like 20-30% faster by this, though this is a very rough measurement.

BreakpointsWidget: Add option to toggle all breaking

Allows you to quickly stop breaking, play the game, then re-enable breaking. useful if you have many active breakpoints, but need to run the game.