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Merge #275 #276

275: Add `libtock_runtime` startup code. r=alistair23 a=jrvanwhy

This includes:

1. `rust_start`: The first Rust code to run in a process
1. `set_main!`: Used to specify `main` in a process binary
1. `stack_size!`: Used to specify the stack size in a process binary
1. Documentation of the startup sequence, including the 3 above steps.

The documentation refers to a two things that haven't been implemented yet:
1. Debug syscalls performed by `rust_start` -- unimplemented because `memop` is
   still unimplemented.
1. The `exit` system call.

276: Add a tock2 submodule with a tock-2.0-dev kernel. r=alistair23 a=jrvanwhy

I intend to use this kernel in integration tests for the Tock 2.0 crates. When we are ready to remove Tock 1.x support, I will remove the duplicate submodule.

Co-authored-by: Johnathan Van Why <jrvanwhy@google.com>