text-based file source/sink

[guruofquality]

Create text-based file IO blocks that have configurable delineations.

[guruofquality]

Created a text-file sink: 055a316

A matching file source is going to be harder for a few reasons:

• there’s not string parsing for every type that has a toString() option
• recovering the message type, or buffer type is not possible
• this may mean manual specification for the data type and destination: message, stream, packet...

Currently, an entire port can be written to file and recovered by using: serializer -> binary file sink, and binary file source -> deserializer. So maybe since that use case is already covered, we dont need a text file source, or perhaps a very dumbed down source with only basic stream options.