CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

Create a new cc_show_day rule instead of a new cc_show
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

- Fixed resizing repeating shows to not include edited instances
- Fixed context menu on repeating shows with edited instances
- Fixed populated the show form when editing a single instance
Fixed minor bugs
Copy/paste error
Was setting cc_show_days twice
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

Create a new cc_show_day rule instead of a new cc_show
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

- Fixed resizing repeating shows to not include edited instances
- Fixed context menu on repeating shows with edited instances
- Fixed populated the show form when editing a single instance
Fixed minor bugs
Copy/paste error
Was setting cc_show_days twice
CC-5595: Improper day of week comparison

Need to convert show instance start time to the show's local timezone before getting
the repeat day of week
Merge branch 'cc-5405' of github.com:sourcefabric/Airtime into cc-5405
CC-5596: Can Recreate an Instance in a Location that has been modified

Fixed by updating the modified instance's start/end time and leaving as a placeholder
for future show updates
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

Removed redundant timestamp var
Removed redundant DateTime object creation
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

Refactored cc_show->isRepeating() function
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

Refactored cc_show_day->getLocalEndDateAndTime() function
CC-5405: When editing a single show instance from a repeating series, should not create a new cc_show

Removed redundant function call to update last_scheduled column on a cc_show_instance
Merge branch '2.5.x' of github.com:sourcefabric/Airtime into 2.5.x