OPAL-1708 -  implemented varaibles creation from a file for view tables only
OPAL-1708 - added template downloading capability in AddVariablesModal MVP. Created a new panel widget to refractor the download button and its label.
Merge pull request #612 from kazoompa/feature-OPAL-1708

OPAL-1708 -  implemented varaibles creation from a file for view tables only