Revert "Turned TownManager into an interface"

This reverts commit 88019f2bca29444c8ab9cc56622e90ca7ff29b32.

Conflicts:
	src/net/jmhertlein/mctowns/MCTowns.java
	src/net/jmhertlein/mctowns/command/MCTLocalSender.java
	src/net/jmhertlein/mctowns/listeners/MCTPvPListener.java