cmake: Start to use ConfigExtra.cmake files

Enables the use of e.g. QT_NO_DEBUG in compiler flags, -fPIC, passing on of
QT_NAMESPACE, etc. pp.

Dropping a lot of custom code which handled adding imported targets for
the command-line tools (this is all being handled by CMake already).

It needs to be investigated if we need to resurrect
Qt5GuiConfigExtras.cmake.in in one way or the other.

Change-Id: I4fa141b68fddaad4f33e628c59d5d0b3a7b3a096
Reviewed-by: Simon Hausmann <[email protected]>

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