Standardise layout and naming in corelib benchmarks

Make file names match CMake's test names (and those follow dir-name)
and class names follow tst_ClassName pattern when testing
ClassName. Purge comments about the qmake configs the CMakeLists.txt
are generated from.  Purge empty constructors and init/cleanup methods
of classes.  Fix petty coding style violations.

Add qdir/tree/, qurl, qbench and qset benchmarks to their parent directories'
lists of subdirs. Fix unused return error from qurl benchmark.

Change-Id: Ifc15a3a46e71cf82ad0637753517e0df34049763
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

0 files changed, 0 insertions, 0 deletions