Read environment settings for run (debug) configuration from file

The environment settings for the run targets (used e.g. to debug ctest executable files) could not read the environment from ctest (set with set_test_properties ENVIRONMENT or ENVIRONMENT_MODIFICATIONS). Reasons for that could be found in other issues.

But could the mechanism to modify/add environment variables via BATCH_EDIT in the UI  also be done by reading an environment from file? This could easy handling of starting ctests in debugger without always manually modify system environment.

The file format could be a simple txt file like manually added batch settings. Maybe it may be appropriate to customize to which env the settings should apply (clean, build, system).

The filename could be determined from the test name or given explicitly