Openknx version support

[mumpf]

This change extends version checking of memory content at startup:

• added versionCheckCallback
• added apiVersion to DeviceObject
• added new versionCheck to memory,cpp It changes the old (gerneric) behaviour, using now the apiVersion of the DeviceObject as version in metadata. This is because a changed DeviceObject api prevents the deserializatin of memory content. The dependency on manufacturerId and hardwareType is still as before.

Additionally a versionCheckCallback is added, which allows to check memory content on firmware level.

There is one possible side effect of this change: If someone implemented a version check, which relies on Dataobject::version() property, this will not work in future anymore. A possible solution is to use DataObject::hardwareType() instead or implement the old behaviour in an own versionCheckCallback-Handler.

[lgtm-com[bot]]

This pull request introduces 1 alert when merging 3886fa5e9fdfe393196781ff6685fb16ea404e26 into a10fa20bde3b70413a74af5e750ba18801520029 - view on LGTM.com

new alerts:

• 1 for Variable used in its own initializer

[mumpf]

Should now be ok. Hope so...

[mumpf]

Hi, I hope that was the final one...

Thank for your support.

[thelsing]

Merged. Thanks.