[debug] debug knobs adjustments (#4317)

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-------------------
minor changes to debug knobs:

-changed its category to System so it becomes per-game-able (believe me, it's useful)
-fixed kotlin field type to UShort
-changed get to Get for proper standard
-added spacings and more info to docs

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4317
Reviewed-by: Lizzie and Samuel <lizzie@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>

src/common/settings.cpp

@@ -146,7 +146,7 @@ void LogSettings() {
 #undef LOG_PATH
 }
 
-bool getDebugKnobAt(u8 i) {
+bool GetDebugKnobAt(u8 i) {
     return (values.debug_knobs.GetValue() & (1 << (i & 0xF))) != 0;
 }