Updated a lot

Added create command (script must be configured first)
Added port option
Split up infrequently changed command line args and commonly changed command line args (added EXTRAPARAMS)

Changed 'update' to automatically create the log directory and game root directory
Changed default steam credentials to anonymous
Changed default email to "" to disable it by default
Split up standard and commonly changed command line options, adding a
new option EXTRAPARAMS
Moved some options around and split some options into the 'Advanced
config' section

Updated readme