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/JSupport/JSUFileStream.cpp

@@ -0,0 +1,63 @@
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
+#include "JSystem/JSupport/JSUFileStream.h"
+#include "JSystem/JKernel/JKRFile.h"
+
+JSUFileInputStream::JSUFileInputStream(JKRFile* pFile) {
+    mFile = pFile;
+    mPosition = 0;
+}
+
+u32 JSUFileInputStream::readData(void* pBuffer, s32 length) {
+    s32 lenRead = 0;
+    if (mFile->isAvailable()) {
+        if (mPosition + length > (u32)mFile->getFileSize()) {
+            length = mFile->getFileSize() - mPosition;
+        }
+
+        if (length > 0) {
+            lenRead = mFile->readData(pBuffer, length, mPosition);
+            if (lenRead < 0) {
+                return 0;
+            } else {
+                mPosition += lenRead;
+            }
+        }
+    }
+
+    return lenRead;
+}
+
+s32 JSUFileInputStream::seekPos(s32 pos, JSUStreamSeekFrom seekFrom) {
+    s32 oldPos = mPosition;
+
+    switch (seekFrom) {
+    case JSUStreamSeekFrom_SET:
+        mPosition = pos;
+        break;
+    case JSUStreamSeekFrom_END:
+        mPosition = mFile->getFileSize() - pos;
+        break;
+    case JSUStreamSeekFrom_CUR:
+        mPosition += pos;
+        break;
+    }
+
+    if (mPosition < 0) {
+        mPosition = 0;
+    }
+
+    if (mPosition > mFile->getFileSize()) {
+        mPosition = mFile->getFileSize();
+    }
+
+    return mPosition - oldPos;
+}
+
+s32 JSUFileInputStream::getLength() const {
+    return mFile->getFileSize();
+}
+
+s32 JSUFileInputStream::getPosition() const {
+    return mPosition;
+}