Autogen: Refactor cmQtAutoGenerators

The refactoring of cmQtAutoGenerators serializes the program flow and
makes it less jumpy in terms of function calling.
Instead of keeping and passing multiple std::vectors and std::maps in
function arguments, single lists with job descriptions are used,
one job list for MOC, UIC, RCC respectively.
Several utility functions and methods were replaced with scoped lambdas
and the remaining methods were sorted by their scope (MOC, UIC, RCC).

Error and warning messages were refactored to be more verbose
about the problem at hand.

The source parsing algorithms were rewritten in large parts.
In the process a lack of functionality of CMAKE_AUTOMOC_DEPEND_FILTERS
was discovered and fixed. CMAKE_AUTOMOC_DEPEND_FILTERS did not extract
dependency file names from headers that were not in the target sources
but were registered to AUTOMOC by a `#include "moc_<NAME>.cpp"` statement.
A test for this use case is provided in a follow up commit.

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