Add filters to the builder2ibek file command

[gilesknap]

Because generic IOCs contain support for only one type if device it is frequently necessary to split up old IOCs when translating to ioc.yaml from builder XML.

For this purpose it would be helpful if this tool could assist.

In discussion with @JamesOHeaDLS we decided that it would be useful to have CLI args to filter the set of support modules that get copied into the YAML.

Also it would be useful to split an IOC that connects to multiple pmacs for example into multiple IOCs. This is more challenging to filter but could be done with field values somehow. Some extra thought required on this (or continue to do it manually)