Add buffer -> list -> buffer blocks

[cymplecy]

As I'm doing a lot of work with buffer payloads at the moment in my MQTT broker project,

I'm finding it's easier to convert them into list and then use the extra functionality of the list blocks

to manipulate my data and then convert back again

But I have to cheat and convert them using these sort of constructs

So, I'm thinking we could do with 2 extra buffer category blocks to do the conversions

I'm happy to have a go and do these myself and then send PR once working

Does this sound good/OK with you?

[bartbutenaers]

Go for it ;-)

[cymplecy]

Got it working - just need to tidy up a bit before issuing PR

[cymplecy]

PR issued