Added isFirstSynchronization to options

[simsta6]

• Added isFirstSynchronizations to options
• Made shouldDetectDeletes method protected

If source iModel had different external source aspects, they were imported to target. Then at the end of transformation detectElementsDeletes was called. It would detect that some elements should be deleted, because transformer would get random identifier values, example:

[MichaelBelousov]

If source iModel had different external source aspects, they were imported to target. Then at the end of transformation detectElementsDeletes was called. It would detect that some elements should be deleted, because transformer would get random identifier values,

We shouldn't introduce this "new option" because the transformer is going to expose a higher-level Branching API soon, including an initBranch API which would supersede this. Also, it appears that you're adding this because you're not using wasSourceIModelCopiedToTarget in the branch initialization, which is not supported by the transformer.

[MichaelBelousov]

Also adding, it seems the bug this was fixing was due to a default targetScopeElement 0x1 which conflicted with the scope of ExternalSourceAspect's added by others. The default of targetScopeElement is very bad and the default will be removed in 1.x