co⚡e: Sparkplug™ MQTT edge

v0.9.0.6
Fixed the connect / disconnect (?) => TEST this ;-)
The EoN now gracefully disconnects after a MQTT CLIENT ERROR happens

0.9.0.4
Eon Enable moved to internal vars and initial value = TRUE
Added immutable log
Added project info for immutable log purpose
Added library info for immutable log purpose

v0.9.0.3
Revised EoN state machine
Improved MQTT Diagnosis feedback messages in sparkplug log (MQTTErrorToString)

Todo:
-Debug the EoN for a correct behaviour when connect-disconnect-connect (statemachine works but
the underlying code needs some more debugging as expected)
-Immutable startup logging (lib version etc) is currently static(!) and gets filtered by the verbosefilter

recommit of v0.9.0.1:
EoN statemachine heavily revised
SparkplugB Log with verbose filter (none, err, err_wrn, err_wrn_inf)
EoN connect functionality

merging v0.0.0.35 library into trunk

Committing v0.0.0.25 from Aliazzz Branch;
TLS Support for EoN
PublishPeriod
Correction of illegal Characters (/,#,+) in device, node and groupid
Many fixes etc.

update to v0.0.0.21 from aliazzz branch

Updated trunk to UNTESTED 0.0.0.20 version of Aliazzz Branch

New trunk project as a copy from Aliazzz personal Branch...