Add two runner scripts - one for qemu, one for device

A debug build does NOT work on hw because it uses
the stack before setting it!

device.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+cargo xbuild --target=targets/aarch64-vesper-metta.json --release && \
+sh .cargo/runscript.sh target/aarch64-vesper-metta/release/vesper && \
+cp target/aarch64-vesper-metta/release/vesper.bin /Volumes/boot/vesper && \
+diskutil eject /Volumes/boot/

qemu.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+cargo xbuild --target=targets/aarch64-vesper-metta.json --release && \
+sh .cargo/runscript.sh target/aarch64-vesper-metta/release/vesper