Facilitate creation of module for testing and creating test files in the module

[MichaelBCG]

This pull request:

• makes it easier to create UE module for tests (assist_tests_module_creation.bat)
• makes it easier to create test files both in a module for tests and inside the UE game project
• allows to exclude the module for tests from the OpenCppCoverage report
• introduces TestsModuleName variable in config.bat. This variable defines the module's name for tests.

Please note that this functionality does not create UE module completely, it creates only folder, .Build.cs, .h and .cpp files for the module

Other notes:

• This pull request is built on top of another pull request (Add feature: Inform users about CppCoverage exclude path when creating tests files, and fix typo in Exlude #20)
• There are three commits included for the clarity of the changes made

Some samples of user dialogue:

• when running assist_tests_module_creation.bat:
  
• when running create_spec_file.bat or create_test_file.bat :