Use webassembly as target in QDS

As user, I want to run my QDS project as webassembly target as easy as possible.

Webassembly works with Qt 6.2.1 by patching the CMakeFiles.txt and wasm.prf on the mkspecs of the Qt 6.2.1.

Needs:

• UX concept

• Integrate WASM toolchain to QDS (as addon?)