ESI parser compliance - step 2 (#387)

[leducp]

Parse // with full attributes and drive 0x1C00 synthesis from the parsed list.
Move enums and packed register structs into kickcat::SyncManager:: and kickcat::fmmu:: sub-namespaces with throwing fromString.

[github-actions]

File	Coverage	Lines	Branches
All files	78%	81%	75%	✅
lib/include/kickcat/Error.h	91%	100%	83%	✅
lib/include/kickcat/SBufQueue.h	80%	98%	63%	✅
lib/master/include/kickcat/SIIParser.h	91%	100%	83%	✅
lib/master/src/Bus.cc	91%	92%	89%	✅
lib/master/src/CoE.cc	61%	71%	51%	❌
lib/master/src/Link.cc	98%	100%	97%	✅
lib/master/src/MailboxSequencer.cc	97%	100%	94%	✅
lib/master/src/MasterOD.cc	99%	99%	100%	✅
lib/master/src/Prints.cc	95%	95%	95%	✅
lib/master/src/Slave.cc	27%	42%	12%	❌
lib/master/src/dc.cc	0%	0%	0%	❌
lib/slave/src/AbstractESC.cc	92%	100%	84%	✅
lib/slave/src/AbstractEmulatedEEPROM.cc	0%	0%	0%	❌
lib/slave/src/ESMStates.cc	96%	98%	94%	✅
lib/slave/src/ESM.cc	95%	100%	90%	✅
lib/slave/src/PDO.cc	92%	97%	88%	✅
lib/slave/src/ESC/EmulatedESC.cc	57%	63%	51%	❌
lib/slave/src/ESC/Lan9252.cc	0%	0%	0%	❌
lib/src/Frame.cc	98%	100%	97%	✅
lib/src/Mailbox.cc	89%	93%	85%	✅
lib/src/SIIParser.cc	40%	50%	30%	❌
lib/src/protocol.cc	90%	87%	92%	✅
lib/src/CoE/OD.cc	98%	98%	98%	✅
lib/src/CoE/protocol.cc	93%	93%	94%	✅
lib/src/CoE/CiA/DS402/StateMachine.cc	93%	94%	92%	✅
lib/src/CoE/mailbox/request.cc	80%	84%	76%	✅
lib/src/CoE/mailbox/response.cc	91%	96%	87%	✅
lib/src/ESI/Parser.cc	87%	90%	83%	✅
lib/src/EoE/protocol.cc	0%	0%	0%	❌

Minimum allowed coverage is 75%

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