Changing the theme and adding a new login.ztml

I have deleted the old zpanelx theme and renamed the new theme the same. I have added d3c0y's login.ztml file (because it uses Bootstrap) and the css files needed to get it working.

I have changed the way the master and login files called the css files as there were hard coded with script path instead of <# ui_tpl_assetfolderpath #> (which I have added). I feel that this is a better standard than the way that it was. Also the Copyright end date wasn't using <# ui_tpl_year #> so I added that also.

I have fully tested my changes and I can confirm that everything is working.