If Dolphin crashes, changes that have been made to settings are often
lost. This has been a minor annoyance for me when developing, but it has
become a much bigger issue recently due to the problem where Dolphin
freezes on shutdown for ROG Ally users.

Instead of saving the config when certain arbitrary settings are
changed, let's save the config when the user closes the settings window.

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.

CheatsManager: Update code tabs on creation

The logic in the code was deliberately avoiding index `2` (**Selected
Font**; the debug font) by using `std::min(index, 1)`. Presumably, the
reason was that there was no debugger in Qt version of Dolphin at the
time.

Test plan:

- Select a debug font via the **Options > Font...** action.
- Show the **Log** tab via the **View > Log** action.
- In the **Log** tab, choose the **Selected Font** item in the combobox.
- Restart Dolphin.

**Without** the patch, the **Monospaced Font** item is wrongly selected
in the combobox.

**With** the patch, the **Selected Font** item is now properly restored
from the saved settings, and the selected debug font is correctly used
in the log messages.

Core: Add SDL Hints settings

Signed-off-by: Andrew Strauss <astrauss11@gmail.com>

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.

Cheat Search: Add ability to delete items and fix duplicate commands