AddChild test fix

`sortAllChildren` should not be part of the test.
It is tested separatedly on another test
Adds better names to test

And new values for get(),add(),remove(),sort(),reorder()
Merge branch 'perf_addchild_test_fix' into array_list

Conflicts:
	samples/Cpp/TestCpp/Classes/PerformanceTest/PerformanceNodeChildrenTest.cpp