install calendar sync only when Calendar app installed

[Bill Filler]

Currently the Google Calendar sync service file is installed by sync-monitor-uoa package. This should be removed. Instead we need to only install the service file when the Calendar app is installed and remove it when the Calendar app is uninstalled.

To do this, we need to make a click hook package that will do the work when it detects the package install/uninstall.

Click hooks are here to look at an example:
/usr/share/click/hooks

According to Jamie this should be a "user" click hook not a "system" click hook.

[Bill Filler (bfiller)]

Also, the uninstall click hook should prompt the user if they want to delete all the Calendar data

[Renato Araujo Oliveira Filho (renatofilho)]

A good example of click account provider can be found on this MR:

https://code.launchpad.net/~dpm/reminders-app/account-click/+merge/230768

[Renato Araujo Oliveira Filho (renatofilho)]

@bfiller

There is no way to check if the hook is running during the installation or uninstall.

[Renato Araujo Oliveira Filho (renatofilho)]

Ok now sync-monitor will install the base files and the calendar app will install the final "application" file necessary to enable the option in online accounts.

[Ubuntu Phone Apps Jenkins Bot (ubuntu-phone-apps-jenkins-bot)]

Fix committed into lp:ubuntu-calendar-app at revision None, scheduled for release in ubuntu-calendar-app, milestone rtm14