New tool idea: assist in variable linking

[RobertoRoos]

Variable linking is tedious and prone to outright disappear. It could be cool to have a tool for this.

Options I can think of now:

• Name based links: link PLC io to HWIO through both variable names
• Rely on exported links ('mappings'): so you can verify in CI whether the last export matches the current project, then your maps become very explicit
• Rely on external mappings - basically a .txt that contains either exact maps or maybe also some kind of regex matches (to minimize content)
• Use variable comments - something like:

  myVar      AT %I*: BOOL; // link: Master/EK91100/EL200/channel1
  

  • Though this gets more difficult when we use intermediate IO objects, e.g. FB_DigitalOut. The I/Q variables themselves cannot be bound with specific links.