…nition

This was especially problematic if the line ended with the comment,
since then the next line would be added, too, even though the current
one didn't end with a '\'

This prevented QT6_DECL_NEW_OVERLOAD_TAIL from being expanded correctly

they don't have an implementation.

Often the friend definitions are the only definition there is, and we
translate these definitions (currently always operators) to wrapper
members then.

(this fixes some parser errors)

that might use the "spaceship" operator for C++20 and onwards.

The generator had trouble to parse these. Simply replace the definitions
with something that works for the generator.

…alue)

to differentiate new methods with a different return value from the old,
deprecated ones.

(this fixes some parser errors)

(this fixes some parser errors)

(this fixes some parser errors)

Add an entry "aliases" to a type entry in the type database, these types
will automatically be changed to the main type in the generated code.

This fixes the problem that in Qt 6.7 QAudio enums are used under the
QtAudio alias. These enum names are now automatically mapped to the
QAudio name with the right alias entries in the type database.

This doesn't make QAudio available as QtAudio in Python, though.

Print the place in the code where the (ambiguous) parser error was
emitted (currently only for GCC and MSVC)

(should fix compare methods generated twice for Qt 5.12/5.15)