Version numbers in main engine

## Expected Behavior
I want to be able to see what version is running for a given install instance.
I would like to know what version my Contrib module is being by.
scly should report version
source should show reference to version number
modules when being loaded should know the main instance version number so they can determine if they are compatible.

## Actual Behavior
There is no version number or reporting of said number

## Environment details (OS, Python/package versions, any other hardware)
all

## Steps to reproduce
1. Try to figure out what version is running on an old instance