make sure we use ordered list of document/projectIds when creating checksum
make sure we set HasAllInformation when creating projectInfo

added unit test

1. filter out projects that is not supported in remote host when calculating checksum
2. wrong validation on contract

unit test added

now, update time on typing is most of time 0 ms on roslyn solution.

removed serializedSolution/Project/DocumentInfo and rolled them into …

separated checksum creation from ISolutionSynchronizationService

now all solution checksum data is moved down to solution states. and ISolutionSynchrnoizationService will only do synchrnoization between 2 hosts.