Add human friendly PVs for water signals (temperature, interlock and flow)

See https://jira.esss.lu.se/browse/ICSHWI-9961

• Exports signals though human friendly PVs
  • Uses CPP instead of CP on input links
• Updates to EPICS 7.0.6.1
• Updates to require 4.0.0
• Updates to ecmccfg 8.0.0
• Minor code cleanup/improvements:
  • Removes unnecessary forward of PLC_MACROS
  • Removes debug configuration
  • Calls common_config.iocsh last
  • Removes explicit call to iocInit
  • No longer forwards IOC macro to startup.cmd
  • No longer uses ECMCCFG_INIT
  • No longer sets SLAVE_ID, uses ecmccfg native slave number calculation
  • Add documentation link to README