Merge topic 'autogen-rcc-custom-command'

40434631 Autogen: Use integers instead of strings for the Qt version
be11a852 Autogen: Use project relative paths in rcc custom command comment
ab9d5896 Autogen: Detect rcc feature once during configuration
2a85b5ac Autogen: Make cmQtAutoGeneratorInitializer an instantiable class
75819b86 Autogen: Add and use cmQtAutoGenerator base class
27ed3b35 Autogen: Rename cmQtAutoGenerators to cmQtAutoGeneratorMocUic
1cd285fe Autogen: Remove rcc code from cmQtAutoGenerators
a87f82e0 Autogen: Switch to use custom commands for RCC
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1494