Disable swipe dismiss on milestone and issue creation. Also fix crash on fetching labels on a new issue.

Make retrofit callbacks better by simplifiing them so that all errors are handled in the onAllError block.

Show Snackbar when text is copied instead of toast. Change some other Toasts to Snackbars. Fix palette to be more efficient.

Make it where the spinners are custom so that we can show our own views and also show a custom item for no milestone or user. Update API call so that we can support creating issues with assignee and milestone, as well as edit issues with that information.