Removed forced lower case from VALUE in getPropertiesValue

This makes using custom mscs-xxx-xxx properties with replacement
variables like $SERVER_VERSION possible.
First part of required forge changes

Missing:
 - Start the forge server
 - Copy libraries for servers of MC version 1.5.2 or lower
 - Modify watchLog to eithe watch server.log or ForgeModloader.log
 - Probably others things i forgot