Commits to wrong branch by accident.

 * Convert `sandbox` to `template`

Including:

 * Bringing in some changes to facilitate use on 307 and 203
 * Work with rv003usb bootloader
 * Windows cleanup
 * Random ch32v003fun bugfixes.

clobber all caller saved registers when calling an init_array

Ardulink - control power instead of reset

 * Resolving unlock bug in halt mode modification.
 * Start to generalize block sizes.
 * Allow for full-erase-fast-program.
 * Almost have USB bootloader working.

Make Ardulink compilable on Windows