Add Holtek ISP USB Protocol Support (v2)

[hansemro]

For HT32 ISP discussion, see #12.

Working commands (with -t isp):

• info : prints ISP version, model, page size, flash size
• version : get ISP version
• reboot : reboot device
• wipe : mass erase device
• dump : dump entire flash (dumps zeros if flash security is enabled)
• flash : mass erases device then flashes image starting at address 0
  • version argument need to be passed but will be ignored

Non-working commands:

• setversion : does nothing as it is impossible to write to ROM

Version 2 changes:

• Resolves major Windows regression experienced in #15 by keeping hid_WINDOWS.c and leveraging on HidD_GetInputReport to do GET_REPORT control transfers.
  • This ultimately made me drop support for arbitrary control messages in favor for fewer regressions (introduced by using hid_libusb on Windows).
  • macOS and Linux will continue to use libusb 1.0.
• Squash and clean up commits.

Requires #11 for compiling in MSYS2/MINGW environment.

[hansemro]

Fixed minor errors on macOS and Windows.