Moved config.yml for easy access via the IDE.

Hopefully this change is compatible with other IDEs.
Made output optional for ScoreboardExecutor.java

A user complained about the output spamming the console and server logs,
so I made the output optional.

New commands for quiet mode, verbose mode, and to toggle between the modes

./sb quiet
./sb verbose
./sb toggle

Verbose mode is the default. But I also added a new configuration option
in the config.yml to change this.
Added new configuration option

path: "executors.arenaScoreboard.message"
default value: true

true = messages will be displayed.
false = messages will be hidden.
Loads path "executors.arenaScoreboard.messages"

from config.yml

and assigns the value to Defaults.SB_MESSAGES
Added new Default for SB_MESSAGES

This option is for ScoreboardExecutor.java

The messages for this executor can be configured to be hidden or shown.

true = messages will be displayed.
false = messages will be hidden.
Use new constructor for ScoreboardExecutor.java

That accepts a boolean value for whether or not messages will be displayed
or hidden.
Added permissions attribute.
Added permissions attribute.

The ArenaClass now has an attribute for permissions.
However, this is not yet fully implemented.

Permission nodes are not yet given or taken away from players.
Removed debugging line.

Originally had a System.out.println() in order to show the output during
startup. After testing, I commented out this line again.
Added /aa setspawn. Changed /aa addspawn.

/aa addspawn
No longer requires an index argument.

/aa setspawn
Requires an index argument.

This needs to be tested.
BattleArena v3.9.7.12