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, 3 insertions, 2 deletions

diff --git a/src/ARMJIT_x64/ARMJIT_Branch.cpp b/src/ARMJIT_x64/ARMJIT_Branch.cpp
index 5d76447..f7a01f4 100644
--- a/src/ARMJIT_x64/ARMJIT_Branch.cpp
+++ b/src/ARMJIT_x64/ARMJIT_Branch.cpp
@@ -18,6 +18,7 @@
 
 #include "ARMJIT_Compiler.h"
 #include "../ARM.h"
+#include "../NDS.h"
 
 using namespace Gen;
 
@@ -120,7 +121,7 @@ void Compiler::Comp_JumpTo(u32 addr, bool forceNonConstantCycles)
             u32 compileTimePC = CurCPU->R[15];
             CurCPU->R[15] = newPC;
 
-            cycles += NDS::ARM7MemTimings[codeCycles][0] + NDS::ARM7MemTimings[codeCycles][1];
+            cycles += NDS.ARM7MemTimings[codeCycles][0] + NDS.ARM7MemTimings[codeCycles][1];
 
             CurCPU->R[15] = compileTimePC;
         }
@@ -132,7 +133,7 @@ void Compiler::Comp_JumpTo(u32 addr, bool forceNonConstantCycles)
             u32 compileTimePC = CurCPU->R[15];
             CurCPU->R[15] = newPC;
 
-            cycles += NDS::ARM7MemTimings[codeCycles][2] + NDS::ARM7MemTimings[codeCycles][3];
+            cycles += NDS.ARM7MemTimings[codeCycles][2] + NDS.ARM7MemTimings[codeCycles][3];
 
             CurCPU->R[15] = compileTimePC;
         }