Unify SyncText, CodingDojo creation and instVar use

[adcxyz]

Following discussion with @bgola today, ideas for uni/simplification:

Both SyncText and CodingDojo contain an OSCRouterClient instance which has username, groupname, serveraddress, so the corresponding instvars in SyncText and CodingDojo are duplications.

These could be unified as follows:

• SyncText.userID just calls OSCRouterClient.userName etc.
• Both SyncText and CodingDojo get two creation methods:
  One is with an existing oscRouter, like SyncText is, minus the userID arg:

~oscar = OSCRouterClient(...);
SyncText.using(~textID, ~oscar); 
CodingDojo.using(~dojoID, ~oscar); 

two is with all args for the OSCRouterClient (as CodingDojo does already):

SyncText(\textID, ~userName, ~groupName, ~serverAddr, ~userpassword, etc etc )); 
CodingDojo(~userName, ~dojoName, ~serverAddr, ...);

[adcxyz]

@bgola
Thought about this some more, and now I think it would be best
to always make OSCRouterClient by hand, and pass it in.
plus:

• cleaner, clearer what is going on, people encounter and learn about OSCRouterClient
• less convenience-supporting code to maintain that relies on OSCRouterClient implementation
  minus:
• existing setup files need rewrite (but seems worth it)