Merge pull request #515 from NinjaGrinch/master

Items now die after being on the ground for 5 minutes
move Furnace and Sign to API, move over their respective events to the API

Signed-off-by: Sleaker <sleaker@gmail.com>
Merge pull request #516 from Sleaker/master

move furnace and sign to API
Experience bar works!
Switched from ticks to seconds for Item Spawn Time
Signed-off-by: Steven Downer <grinch@outlook.com>