qt: Add toggle in the settings window for readbacks (#3305)

* Add readback and readback linear image toggles to the settings window

* reuse and crowdin

* clang-format... my worst enemy...

* Experimental group box (#3)

* New Groupbox

* adjustments

* revised warning on experimental group box

---------

Co-authored-by: rainmakerv2 <30595646+rainmakerv3@users.noreply.github.com>

src/common/config.cpp

@@ -415,6 +415,10 @@ void setReadbacks(bool enable) {
     readbacksEnabled = enable;
 }
 
+void setReadbackLinearImages(bool enable) {
+    readbackLinearImagesEnabled = enable;
+}
+
 void setDirectMemoryAccess(bool enable) {
     directMemoryAccessEnabled = enable;
 }