Refs #10525 Minor improvements to new Refl UI

 * Allow columns to be rearranged in the processing table
 * Add the 'Process' action to the toolbar
 * Rename the 'Table' menu to 'Reflectometry'
 * Rename the 'Row' menu to 'Edit'
Merge remote-tracking branch 'origin/feature/10525_new_refl_ui_improvements'