co⚡e: Sparkplug™ MQTT edge

Sparkplug Development Lib v1.4.2.18 changelog, still work in progress
* changed Project Information

* Changed FB_MetricFileTransfer.ReturnFileName (Maybe it should return the filetransfer properties (filesize, filename, full path, any other metadata on the file?)

* Changed FB_StringBuilder as preliminary unittesting shows it contains bugs
regarding WSTRING(80) which is nonsensical for WSTRING

* FB_StringBuilder main body
* FB_StringBuilder.append
* FB_StringBuilder.delete
* FB_StringBuilder.find
* FB_StringBuilder.insertat
* FB_StringBuilder.len
* FB_StringBuilder.mid
* FB_StringBuilder.replaceat
* FB_StringBuilder.right
* FB_StringBuilder.tostring
* FB_StringBuilder.towstring
* Changed ILimitedStringBuilder, EXTENDS __SYSTEM.IQueryInterface
* Changed IStringBuilder, EXTENDS ILimitedStringBuilder
* Added Function ReturnFileName as this function seems to be useful enough
* Added accompanying unittest for FB_StringBuilder in seperate project, also work in progress

v1.4.2.14
* Added FB_SeqCheck with methods: BDSeqNum and SeqNum
* Updated Project Information to enable documentation generation

v1.4.2.12 Library now uses FBFactory to create GroupIDs, RemoteEdges, RemoteDevices and Metrics
You now no longer need to add GroupID, Edge, Device and metric pools in the user project of the PrimaryHost

v1.4.2.10
Fixed [#136] Edge seems to publish "empty" payloads

[#131] v1.4.2.9 fixes issue with skipping DBIRTHs and DDEATHs
incidentally, device messages are now more responsive, as we publish additionally whenever the Node is WAITing for NDATA timer

v1.4.2.8 library changed identity to:
co⚡e: Sparkplug™ MQTT edge and host
CODESYS + MQTT + Sparkplug = 'Plug & Play' IIoT

branch develop : lets keep developing