Miscallenious fixes to gl backend and qt frontend (#6834)

* renderer_gl: Make rasterizer normal class member

* It doesn't need to be heap allocated anymore

* gl_rasterizer: Remove default_texture

* It's unused

* gl_rasterizer: General cleanup

* gl_rasterizer: Lower case lambdas

* Match style with review comments from vulkan backend

* rasterizer_cache: Prevent memory leak

* Since the switch from shared_ptr these surfaces were no longer being destroyed properly. Use our garbage collector for that purpose to destroy it safely for both backends

* rasterizer_cache: Make temp copy of old surface

* The custom surface would override the memory region of the old region resulting in garbage data, this ensures the custom surface is constructed correctly

* citra_qt: Manually create dialog tabs

* Allows for custom constructors which is very useful. While at it, global state is now eliminated from configuration

* citra_qt: Eliminate global system usage

* core: Remove global system usage in memory and HIO

* citra_qt: Use qOverload

* tests: Run clang format

* gl_texture_runtime: Fix surface scaling

src/core/gdbstub/gdbstub.h

@@ -10,6 +10,10 @@
 #include "common/common_types.h"
 #include "core/hle/kernel/thread.h"
 
+namespace Core {
+class System;
+}
+
 namespace GDBStub {
 
 /// Breakpoint Method
@@ -70,7 +74,7 @@ void Break(bool is_memory_break = false);
 bool IsMemoryBreak();
 
 /// Read and handle packet from gdb client.
-void HandlePacket();
+void HandlePacket(Core::System& system);
 
 /**
  * Get the nearest breakpoint of the specified type at the given address.