Teleport should move players to the center of the block (x +.5, z +.5)

CMDBOOK-2157 - Reported by DailyCakeSlice

When I use the teleport command, (I happen to use /tp psplayer 100 69 100) it literally puts me there. Without the plugin, if I issue that command, it puts me at 100.5 69 100.5. It also does the same to command blocks. I happen to need the default server teleports, the one where tping to 100 69 100 really puts you at 100.5 69 100.5, because I make maps, and the commandblocks need to teleport me to a specific block, not in between them like world edit does. If you could please add an option for worledit to override regular TPs or to leave it alone, I'm sure this would help many people. Thanks, Gavin.

No file or test is named. Start by tracing the teleport command and command-block teleport handling, then determine how block coordinates are converted to player positions. Done should match the requested centered coordinates while preserving or clearly configuring the default server teleport behavior.

Written by the indexing model from the issue text.