Revert "Move to Scala OSGi bundles."

This reverts commit 6cccce2c48544cac3f321fc30cf93df7b6f44709.

Conflicts:
	org.scalaide.worksheet.tests/META-INF/MANIFEST.MF
Revert "Bump plugin profiles version."

This reverts commit 32869eae9fbc98a50b8c3f78578a784bd3f0b6a9.
Revert "Fixed source compatibility with Scala IDE master"

This reverts commit 58744e4bd579ef7b428562e810174bebe889211e.
Revert "Fixed source compatibility for latest master"

This reverts commit ff189599a67c2751e55c892decc4e89bd4eaa8bd.
Revert "Fixed compilation issue"

This reverts commit 2cf8a124a0d1d41798b733cf41bc1ff3958e7cd2.