3.1.19-web Zoom In/Out, mac shortcut fixes, better context menus

Zoom In/ Zoom out support

new zoom UI and fonts sub menu

Working set context menu

• Added copy, copy path, duplicate and download option to the working set context menu.
• Working set files context menu layout refactored to mirror project file tree context menu.
  

File menu added option Duplicate File- #1020

Fixes

• code commenting does not indent based on current selection
• Most Keyboard shortcuts don't work on Mac\Chrome