With the QRegExp variant removed, it was weird to have all QSFPM
tests in "tst_qsortfilterproxymodel_regularexpression", even those
completely unrelated to regexps. Instead of reuniting into a single
executable as before, I simply split it out in separate executables:
* tst_qsortfilterproxymodel has the "standard" QSFPM tests
* tst_qsortfilterproxymodel_regularexpression has the regexp-related tests
* tst_qsortfilterproxymodel_recursive is separate as before
Change-Id: I345530b4352671164008bba4805af7b12ac90247
Reviewed-by: Lars Knoll <lars.knoll@qt.io>