Fix entity id remapping

The old system only worked in ints and 1.7 changed some to varints. Since the length of the varint is variable more work is needed to remap ids
Fix server-bound entity ids as well
Move 0x13 to clientbound only
Fix shooterID/ownerID not getting remapped
Fix last commit
Delay is not in milliseconds, its in the TimeUnit
Merge pull request #748 from thinkofdeath/master

Chat Component API
Fix typo in /alertraw error message