Initial bootloader implementation

Took a publicly available XMODEM bootloader and made it work on HK32F.

Known issues:
- Erase is super slow on this MCU. The upload routine erases all flash before loading, which means the first packet seems to hang. This also erases possibly persistent data stored in unused pages on flash.

bootloader_hk32f030m_uart_xmodem/_bin/bootloader_hk32f030m_uart_xmodem_v0.0.1.hex

@@ -0,0 +1,157 @@
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