All of the dependencies of wayless have been updated to their latest
version. This involved some slight reworking of interrupts, as
ExceptionStackFrame got renamed to InterruptStackFrame.

Some bugs in the Makefile have been fixed as well, I hadn't specified
build/ as a dependency of build/size so you couldn't build the project
unless build had already been created. This has been fixed.

In addition the whole project will now be rebuilt if any of the cargo
files are modified, as before I had to `make clean` if I wanted to
rebuild the project after updating Cargo.toml