Refs #10548 Add Import/Export table actions

* Add showAlgorithmDialog action to ReflMainView
* Add Import/Export actions
* Connect Import to "LoadReflTBL"
* Connect Export to "SaveReflTBL"
* Add unit test for Import/Export actions
Merge remote-tracking branch 'origin/feature/10548_refl_import_export_actions'
Merge branch 'master' into feature/8912_CLI_new_branch_to_solve_conflicts