[P020] Add option to process events without network client connected

[tonhuisman]

From a forum request

Features:

• Add option so serial data will be processed even if no network client is connected
• Add option to enable multi-line messages in full, instead of just the first line
• Reformat source using Uncrustify
• Make some UI-notes and logging optional, based on LIMIT_BUILD_SIZE compile-time flag (so it will better fit in some bin-size challenged builds)

TODO:

• Testing unconnected processing (waiting for results from requester) (confirmed)
• Testing multi-line processing (waiting for results from requester) (confirmed)

NB: The ser2netclientsend command will still only work if a network client is connected!