Add client version of (graphql) blackboard to simplify client update

[mrseanryan]

fun blackboard needs a separate list of new funs so that client knows what to do

ClientBlackboardAccessor

• blackboard

graphql: bba.get_new_mutations_and_queries() bba.updateWithClientData(data)

• internally clears out created mutations and queries —- functions: bba.get_new_functions() bba.update_with_new_client_functions()
• internally resets the functions list to the new list

.

[mrseanryan]

• generate() should accept CBB to avoid exposing BB to client

[mrseanryan]

rename main_service to main_generator (up minor version)