[WIP] Qt: Add config window controls (#655)

* Qt: Add config window controls

* Fix Windows build

* Fix audio slider

* Qt configs: Make thread-safe, properly update audio enable & renderdoc settings

* Qt configs: Add `connectCheckbox` function

* Qt configs: Add `connectCheckbox` function

* Rename spuLayout

* Add Discord RPC reloading

* Allow configuring the app icon

* Qt: Serialize icon & theme, properly set them

* Add rnap and rcow icons

* Qt: Fix forceShadergen config

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Co-authored-by: wheremyfoodat <44909372+wheremyfoodat@users.noreply.github.com>

include/discord_rpc.hpp

@@ -17,6 +17,8 @@ namespace Discord {
 		void init();
 		void update(RPCStatus status, const std::string& title);
 		void stop();
+
+		bool running() const { return enabled; }
 	};
 }  // namespace Discord