In the next commit I change conf.settings to be initialized
at runtime instead of load time and so any import of
`from lbrynet.conf import settings` will be and stay None if
it happens before the initialization.
- move analytics creation earlier in the startup process
- add several events to track startup, startup failure, other errors
- abstract platform detection into separate file
- add "build" type to platform so we can differentiate devs vs live users
