Add 3GX plugin loader (#6172)

* Initial plugin loader support

* More plugin loader progress

* Organize code and more plugin features

* Fix clang-format

* Fix compilation and add android gui

* Fix clang-format

* Fix macos build

* Fix copy-paste bug and clang-format

* More merge fixes

* Make suggestions

* Move global variable to static member

* Fix typo

* Apply suggestions

* Proper initialization order

* Allocate plugin memory from SYSTEM instead of APPLICATION

* Do not mark free pages as RWX

* Fix plugins in old 3DS mode.

* Implement KernelSetState and notif 0x203

* Apply changes

* Remove unused variable

* Fix dynarmic commit

* Sublicense files with MIT License

* Remove non-ascii characters from license

src/core/hle/kernel/memory.h

@@ -60,6 +60,14 @@ struct MemoryRegionInfo {
      */
     std::optional<u32> LinearAllocate(u32 size);
 
+    /**
+     * Allocates memory from the linear heap with only size specified.
+     * @param size size of the memory to allocate.
+     * @returns the address offset to the found block, searching from the end of FCRAM; null if
+     * there is no enough space
+     */
+    std::optional<u32> RLinearAllocate(u32 size);
+
     /**
      * Frees one segment of memory. The memory must have been allocated as heap or linear heap.
      * @param offset the region address offset to the beginning of FCRAM.