First attempt at getting the signs of cells to display information #31

The variables possible are:
* %player% - the player's last known name
* %uuid% - the player's uuid, or what can fit on a sign
* %reason% - the reason the player was jailed
* %jailer% - the person/thing who jailed this player
* %afktime% - the amount of time the player has been afk
* %timeinminutes% - the amount of remaining time the player has in
minutes

If the player is jailed forever, then it pulls from the language file
`jailedforeversign` property.

src/main/java/com/graywolf336/jail/enums/Lang.java

@@ -125,10 +125,14 @@ public enum Lang {
     // General section, used by different parts
     /** Part message of any messages which require 'all the jails' or such. */
     ALLJAILS("general"),
+    /** The one line on signs when the cell is empty. */
+    CELLEMPTYSIGN("general"),
     /** The message sent to the sender whenever they try to remove a cell but was unsuccessful due to a prisoner. */
     CELLREMOVALUNSUCCESSFUL("general"),
     /** The message sent whenever a cell is successfully removed. */
     CELLREMOVED("general"),
+    /** The line on a cell's sign when the prisoner is jailed forever. */
+    JAILEDFOREVERSIGN("general"),
     /** The simple word jailing to be put in other parts. */
     JAILING("general"),
     /** The message sent to the sender when they try to remove a jail but there are still prisoners in there. */

src/main/java/com/graywolf336/jail/enums/Settings.java

@@ -9,6 +9,7 @@ public enum Settings {
     BLOCKPLACEPENALTY("jailing.during.blockPlacePenalty"),
     BLOCKPLACEPROTECTION("jailing.during.blockPlaceProtection"),
     BLOCKPLACEWHITELIST("jailing.during.blockPlaceWhiteList"),
+    CELLSIGNLINES("jailing.during.cellsign"),
     CLOTHINGENABLED("jailing.jail.clothing.enabled"),
     CLOTHINGHELMET("jailing.jail.clothing.helmet"),
     CLOTHINGCHEST("jailing.jail.clothing.chest"),