Refactor to F360 add-in template

• refactored folder and file structure to F360's python Add-in template
• fixed issue where and error prevented add-in from loading at start-up
• fixed logging where multiple handlers were being created and preventing log file from being deleted
• fixed edge selection count in edge selection box
• corrected face selection count to be consistent with edge counting approach
• There may still be an issue with OSX devices where the command button appear in the Mfg workspace but not in design