- use shared memory instead of fifos for most I/O
- re-enable functional tests

this resolves #3

Fixed bug with logging. Was accidentally writing rows by 4 rather than by 1, and would write beyond the limits.
Also properly initializing the initial value of the hw_unix_timer so Valgrind doesn't complain.

- Add some prints to scripts to help with debugging
- Add timeout if spawn fails
- Add more time to allow changes to take effect
- Fix input design

And add I2C implementation for virtual quad

- uses virtual quad