* No more needing to decide between printf and UART in code.
 * Better debugprintf input
 * Unified code for all clock sources.
 * TINYVECTOR now saves like another 120 bytes of space.
 * None of the `Makefile`s except `bootloader` need anything extra
 * All configuration via `funconfig.h`
 * Sane defaults.
 * `SystemInit()` also initializes debugging (UART or SWIO depending on configuration)
 * Tunable timeout on debug printf.
 * Configurable UART baud rate.
 * `funconfig.h` is automatically included by `ch32v003fun.h`
 * Paves the way for other, non-003 processors.

 * Fix checksum calculation for escape
 * Add vFlashWrite, vFlashErase and vFlashDone

Closes #159

GPIO port operations, single-parameter pin specifiers

Minichlink 20x/30x Fixes

Add standard input through the debug printf module.  Closes #168

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