Merge #161
161: Cleanup and add a Makefile r=alistair23 a=alistair23
After looking at https://github.com/tock/libtock-rs/issues/160 I think there are some things we can do to make it easier to get started with `libtock-rs`. One of the key things for me with all new projects is how hard is it to build and run this thing. I find the current bundle of scripts confusing and non obvious what I should do/run. This PR moves the linker files out of the main directory (so they don't clutter everything up) and then adds a Tock style Makefile which can be used to build the examples for the boards.
This PR also removes some unused files to again reduce clutter.
If this is merged the next step is to move the `flash.sh` actions into the Makefile and look at supporting building a single app (instead of all of the examples) and how to handle features.
Co-authored-by: Alistair Francis <alistair.francis@wdc.com>
