ruby: slicc: change the way configurable members are specified

ruby: slicc: change the way configurable members are specified
There are two changes this patch makes to the way configurable members of a
state machine are specified in SLICC.  The first change is that the data
member declarations will need to be separated by a semi-colon instead of a
comma.  Secondly, the default value to be assigned would now use SLICC's
assignment operator i.e. ':='.