Clock digits

- added alarms
- you can now right click a clock inside an item frame to bring up the clock UI

- alarms don't support multiple worlds. If you have multiple worlds with environment normal, they will only work in one of them (if you don't use multiverse or simmilar plugin, don't worry about this one).
- alarms unfortunately aren't completely lag free, since they have to check if the world transitioned into day/night every 5 seconds (interval will be configurable once the config is added, until I found a workaround for this).