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now we process all includes and loads in cumulative mode again.
functions without side effects don't need special attention in the first
place, obviously. and the printing functions already have their own
handling.

- include all known functions into the map
  - some of them are actually enabled
- constant_names ~= s,CF_,T_,

Task:	229217

without that, the auto-included highly complex files from mkspecs/ make
it spew out oodles of warnings.
by default, the user-provided files are still scanned in "cumulative"
mode (ignoring conditionals), so we collect as many files as possible.
(ported from qt)

code mostly c&p-d from qmake (sync from qt).

use qset instead of qlist

(merge aa87b75910a99a26e7ec581aa38f8982fe231ad0 from qt)

Details:  ProFileCache be gone, as is ManagedProFile, not to be missed.
Drastically simplified how ownership works.