Prebuilt binaries for common "STLink v2.1" workalike STM32F103CBT6 based debuggers.

Binaries are available at https://armmbed.github.io/DAPLink/ for many boards, but I think it would be very useful to increase the reach of DAPLink by making binaries available for commonly available STM32F103CBT6 based debuggers (e.g. the ones included in ST Nucleo64s, and many other third party work-alike "STLink V2.1" compatible boards - which use the same basic debugger schematic).

A quick look seems to suggest all the code is there already for this, but the vast majority of potential users lack the Keil license which is currently required to build it. Some binaries have been made available online by third parties but these are typically for old releases of DAPLink and/or are poorly documented.

Start by reviewing the DAPLink binaries page and the existing STM32F103CBT6-related build outputs described in the issue. Confirm which common STLink V2.1 workalike boards are in scope and how the current Keil-dependent build is documented. Done means current binaries are available for the target boards with clear build or flashing documentation.

Written by the indexing model from the issue text.