Add detection of CSOM/SSOM support of the target model

[SubPointSupport]

Model can have some definitions unsupported by CSOM. There should be a way to detect these defs and nodes.

That would enable validation on CSOM/O365 compatibility as well as better 3rd part tooling support.

[andreasblueher]

Do you have any idea on how this could be implemented? As discussed in yammer I like the idea and would like to have something like that for M2

[SubPointSupport]

The folllwing test were added:

• Should_Pass_On_Valid_SSOM_CSOM
• Should_Pass_On_Valid_SSOM_Invalid_CSOM
• Should_Pass_On_Valid_SSOM_Invalid_CSOM_2

The following API was added:

• SPMeta2Model.IsCSOMCompatible(model)
• SPMeta2Model.IsSSOMCompatible(model)
• SPMeta2Model.CheckProvisionCompatibility(model)