Added new Debug option
Removed old, unused import
Added listconfig cmd & simplified permissions.

cmd - /bomb setconfig <option> <value>

OLD PERM - bombarena.setconfig.{option}

NEW PERM - bomarena.setconfig

There is no longer a permission node for each option for setconfig
command. Having one node will make it easier on server admins to setup
permissions.

Added new command - /bomb listconfig

This command will list all the configuration options that you can use with
/bomb setconfig command.

Lastly, I added some error handling to catch accidental mistakes in
command syntax.

Namely, /bomb setconfig FakeName <new name>

forces the user to give the Fake Player a space in their name so that it's
easier to distinguish between real players.

Will add more syntax checking in future versions if necessary.
Changed public to private + getter()

Several fields in BombPlugin.java were changed from public to private.

Several other classes were affected by this change: So they were forced to
use the getters()

Some public fields remain.

They might be changed in future versions.