Move ARM9 Main documentation from Ghidra

src/Main/System/OverlayManager.cpp

@@ -0,0 +1,7 @@
+#include "System/OverlayManager.hpp"
+
+void OverlayManager::Load(OverlayIndex index, OverlayId id) {}
+void OverlayManager::LoadIfNotLoaded(OverlayIndex index, OverlayId id) {}
+void OverlayManager::Unload(OverlayIndex index) {}
+void OverlayManager::LoadOverlaySetup(s32 index) {}
+void OverlayManager::UnloadOverlaySetup() {}

src/Main/System/SysNew.cpp

@@ -0,0 +1,11 @@
+#include "System/SysNew.hpp"
+
+void *SysNew(UnkStruct_0202e894 *param1, s32 length, s32 param3) {}
+void SysDelete(void *ptr) {}
+void *func_0202e99c(s32 length) {}
+void *func_0202e9bc(s32 length) {}
+
+void *SysObject::operator new(unsigned long length, u32 *id, u32 idLength) {}
+void *SysObject::operator new[](unsigned long length, u32 *id, u32 idLength) {}
+void SysObject::operator delete(void *ptr) {}
+void SysObject::operator delete[](void *ptr) {}