holoirc: initial addition of Crashlytics
holoirc: more changes to enable Crashlytics integration

* begin work adding a UI to allow user to change sending reports preferences
* add more files to ignore to .gitignore
* add simple and internal flavours - internal needs a Crashlytics API key - simple should be used when not using Crashlytics
holoirc: remove internal folder from .gitignore
holoirc: readd missing imports
holoirc: finish off preferences for bug reports
Merge branch 'crashlytics' into develop