C++: use dsDataType as default style for (Raw) String Literal Prefix
The first commit adds the C++20 module extensions, synchronizes isocpp.xml and cpp.xml and removes the Arduino and Cuda extensions from cpp.xml, as they don't need to check Qt identifiers.
The second commit uses dsDataType for (Raw) String Literal Prefix as discussed in !567 (merged).
On the other hand, after a few tests, I find it disturbing to use dsOperator for suffixes because the color is the same as the symbols and separator. I find dsDataType nicer, what do you think? @davidre @kossebau
Breeze Light / Dark:
