Reorganize library code into libs/ (#3119)

* Reorganize files into libs/{dolphin,JSystem,PowerPC_EABI_Support,revolution,TRK_MINNOW_DOLPHIN}

* Update configure.py and project.py for new libs structure

* Refactor `#include <dolphin/x.h>` -> `<x.h>`

* Remove `__REVOLUTION_SDK__` forwards from dolphin

* Fix dolphin/ references in revolution

* Wrap `#include <dolphin.h>` in `!__REVOLUTION_SDK__`

* Always build TRK against dolphin headers

* Resolve revolution SDK header resolution issues

libs/JSystem/src/J3DU/J3DUDL.cpp

@@ -0,0 +1,9 @@
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
+#include "JSystem/J3DU/J3DUDL.h"
+#include "JSystem/J3DGraphBase/J3DShapeMtx.h"
+
+// Fake function to make the weak function J3DShapeMtx::getUseMtxNum appear in this TU
+u32 J3DUGetUseMtxNum(J3DShapeMtx* i_shapeMtx) {
+    return i_shapeMtx->getUseMtxNum();
+}