Replace bool * array by std::vector<char> in MultiFilterInterface

This replaces a dynamically allocated array of bool by std::vector<char>.
1) This makes the code shorter and less error prone, because memory
   management has not to be done by hand.
2) It fixes a bug in the old code:
   memset(checkState, false, list.count()) is wrong, because bool is
   not guaranteed to be the same size as char!

Two notes:
1) QMap<>, QVector<>, etc. are used numerous times in the code, so
   this doesn't introduce a new C++ concept. Here, the std:: version
   is used, because there is no need for reference counting, COW
   semantics, etc.
2) std::vector<char> is used instead of std::vector<bool>, because
   the latter does a pessimization where a bitfield is used!

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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