Add a script to use multiple Spond functions, as a simple end-to-end manual assurance test.

[elliot-100]

Uses Spond 'get' functions to summarise available data.

Uses all existing group, event, message get_ methods.
Doesn't yet use get_person() (it's not as simple to test as the other get methods) or any send_, update_ methods.
It also uses print rather than logging to console, which I can can come back to.

[Olen]

Good idea.
Not sure we need a proper test-framework yet, but this is a good start.

[maiminhp]

Great PR! It's always good to have tests... and it's not so straightforward with asyncio (but more because I haven't had a whole lot experience on it). This would already help any developers have some peace of mind that we're not breaking anything while touching the code