Refactor `NDS` and `DSi` to be objects (#1893)

* First crack at refactoring NDS and DSi into objects

- Remove all global/`static` variables in `NDS` and related classes
- Rely more on virtual dispatch when we need to pick methods at runtime
- Pass `NDS&` or `DSi&` to its constituent components where necessary
- Introduce some headers or move some definitions to break `#include` cycles

* Refactor the frontend to accommodate the core's changes

* Move up `SchedList`'s declaration

- Move it to before the components are initialized so the `map`s inside are initialized
- Fields in C++ are initialized in the order they're declared

* Fix a crash when allocating memory

* Fix JIT-free builds

* Fix GDB-free builds

* Fix Linux builds

- Explicitly qualify some member types in NDS, since they share the same name as their classes

* Remove an unnecessary template argument

- This was causing the build to fail on macOS

* Fix ARM and Android builds

* Rename `Constants.h` to `MemConstants.h`

* Add `NDS::IsRunning()`

* Use an `#include` guard instead of `#pragma once`

1 files changed, 8 insertions, 8 deletions

diff --git a/src/frontend/Util_Audio.cpp b/src/frontend/Util_Audio.cpp
index 4a1d089..02b3026 100644
--- a/src/frontend/Util_Audio.cpp
+++ b/src/frontend/Util_Audio.cpp
@@ -82,13 +82,13 @@ void AudioOut_Resample(s16* inbuf, int inlen, s16* outbuf, int outlen, int volum
 }
 
 
-void Mic_FeedSilence()
+void Mic_FeedSilence(NDS& nds)
 {
     MicBufferReadPos = 0;
-    NDS::MicInputFrame(NULL, 0);
+    nds.MicInputFrame(NULL, 0);
 }
 
-void Mic_FeedNoise()
+void Mic_FeedNoise(NDS& nds)
 {
     int sample_len = sizeof(mic_blow) / sizeof(u16);
     static int sample_pos = 0;
@@ -102,12 +102,12 @@ void Mic_FeedNoise()
         if (sample_pos >= sample_len) sample_pos = 0;
     }
 
-    NDS::MicInputFrame(tmp, 735);
+    nds.MicInputFrame(tmp, 735);
 }
 
-void Mic_FeedExternalBuffer()
+void Mic_FeedExternalBuffer(NDS& nds)
 {
-    if (!MicBuffer) return Mic_FeedSilence();
+    if (!MicBuffer) return Mic_FeedSilence(nds);
 
     if ((MicBufferReadPos + 735) > MicBufferLength)
     {
@@ -116,12 +116,12 @@ void Mic_FeedExternalBuffer()
         memcpy(&tmp[0], &MicBuffer[MicBufferReadPos], len1*sizeof(s16));
         memcpy(&tmp[len1], &MicBuffer[0], (735 - len1)*sizeof(s16));
 
-        NDS::MicInputFrame(tmp, 735);
+        nds.MicInputFrame(tmp, 735);
         MicBufferReadPos = 735 - len1;
     }
     else
     {
-        NDS::MicInputFrame(&MicBuffer[MicBufferReadPos], 735);
+        nds.MicInputFrame(&MicBuffer[MicBufferReadPos], 735);
         MicBufferReadPos += 735;
     }
 }