BLACKLIST files cleanup

The goal of the task is to clean up existing BLACKLIST files in the test source tree.

1 Identify test cases sharing one folder and one BLACKLIST file. (eg tst_qwindow.cpp and tst_foreignwindow.cpp). Split such cases to 2 different folders (each for each test case).  If needed modify BLACKLIST file and cmake files. 

Reason - in case there is function name overlap eg. testcaseA has test function and testcase B also has test function 1 - and test function 1 is blacklisted - both functions of 2 different test cases will be blacklisted. We want to prevent accidental "blacklist shadowing" of functions

2 Remove entries  referring to obsolete - no longer used platforms, test functions or data tags.