fernly: Fix printf("%d") > 99999

This adds lots of divison code, which fixes, among other things,
calling printf() with %d greater than 99999.
main: Add msleep command

Using a delay loop, it's more or less working right.
main: Fix "(null)" when unknown command is tried

It used to print out "Unknown command: (null)".  Fix it so that it
prints out the actual command instead.
usb-loader: Remove unneeded code

We remove more code from usb-loader, to make it fit in weird places.
fernvale: Fully get PSRAM working

This uses scriptic to run scripts that do bringup of various systems.