objects -- manage lifecycle of memory model w.r.t. Go things

[scott-cotton]

Tasks:

• creation
• function call #45
• map update, lookup
• slice indexing
• interfaces
• plain serialise
• channels

[scott-cotton]

commit 991f7a5 makes progress on creation.

[scott-cotton]

commit bcbf71a is a fairly complete prototype of creation. It also starts a bit on serialisation.

[scott-cotton]

marking plain serialisation "done", as it is mostly done. surely some holes or bugs somewhere, but done enough to move on.