Starting from Qul 1.5 json kit file will be shipped for desktop platform.
This change is backward compatible with previous Qul version - if no
desktop specific json file is found a legacy code is executed.
This change removes "desktop" toolchain, instead "msvc" and "gcc"
toolchains are introduced.
Additional parameter was introduced to the josn kit file: "platformName"
which enables using different strings in kit name and in QUL_PLATFORM
cmake variable.
Change-Id: Ie0a212aaad47a8033e9a81467f60a23c2bc19a51
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>