Investigate PCOMP Table module

[tomtrafford]

Investigating the potential of writing a new module combining the current pcomp functionality but using an input table defining a series of Start Stop Step positions.

[coretl]

To check:

• The pros and cons of adding a TABLE to the existing PCOMP block, vs making a new block. It's worth trying it both ways to see if we can squeeze it into the current firmware
• Whether we can use the table append command over the TCP server to essentially fill the DMA table in chunks forever. The interplay with *CHANGES and an ever growing table needs to be considered. @Araneidae might have thoughts on this.
• How we would model the table value in the IOC for a consumable buffer
• If PGEN.TABLE can benefit from any of these changes