Remove the last ConfigEntry state (#1902)

* Get rid of `ConfigEntry::ExternalBIOSEnable`

- Now the BIOS files themselves are checked
- The frontend's `Config::ExternalBIOSEnable` is not affected

* Add `JITArgs`

* Pass the JIT status to the `ARM` constructors

* Encapsulate `NDS::EnableJIT`

* Pass `JITArgs` to `ARMJIT`'s constructor

* Remove the `JIT_*` `ConfigEntry`s in favor of members

- Allow all the JIT args to be set with `NDS::SetJITArgs`
- Encapsulate the JIT-related parameters in `ARMJIT` so they can reset the block cache if changed
- Update the active (or newly-created) console in the frontend with adjusted JIT args

* Make audio bit depth and interpolation configurable in `NDSArgs`

- Define enums for both
- Give those settings default values in `NDSArgs`
- Remove `ConfigEntry::AudioBitDepth`
- Initialize these settings in the relevant SPU constructors

* Move the last DSi-specific logic in `Reset` to its own subclass

* Remove `ConfigEntry::DSi_FullBIOSBoot`

- Add members to `DSi` instead for getting and setting this
- Update the frontend to accommodate these changes

* Oops, missed a spot

* Remove `ConfigEntry::Firm_MAC` and `Platform::GetConfigArray`

- Also move the MAC parsing code to `ROMManager`

* Remove the last `ConfigEntry` state

- Make GDB support configurable via members

* Add some `#ifdef`s that I'd almost forgotten

src/NDSCart.cpp

@@ -109,9 +109,9 @@ void NDSCartSlot::Key1_ApplyKeycode(u32* keycode, u32 mod) noexcept
     }
 }
 
-void NDSCartSlot::Key1_LoadKeyBuf(bool dsi, bool externalBios, u8 *bios, u32 biosLength) noexcept
+void NDSCartSlot::Key1_LoadKeyBuf(bool dsi, u8 *bios, u32 biosLength) noexcept
 {
-    if (externalBios)
+    if (!NDS.IsLoadedARM7BIOSBuiltIn())
     {
         u32 expected_bios_length = dsi ? 0x10000 : 0x4000;
         if (biosLength != expected_bios_length)
@@ -138,7 +138,7 @@ void NDSCartSlot::Key1_LoadKeyBuf(bool dsi, bool externalBios, u8 *bios, u32 bio
 
 void NDSCartSlot::Key1_InitKeycode(bool dsi, u32 idcode, u32 level, u32 mod, u8 *bios, u32 biosLength) noexcept
 {
-    Key1_LoadKeyBuf(dsi, Platform::GetConfigBool(Platform::ExternalBIOSEnable), bios, biosLength);
+    Key1_LoadKeyBuf(dsi, bios, biosLength);
 
     u32 keycode[3] = {idcode, idcode>>1, idcode<<1};
     if (level >= 1) Key1_ApplyKeycode(keycode, mod);