Preemptively bump scijava-common and imagej-common
Add SciJava and ImageJ plugin projects
Add ImageJ Legacy project
Revert "Remove obsolete ImageJ components"

This reverts commit 81d82c4c8b8192a0b93bd87f05dceeb2861010fe.

After further consideration, it was premature to remove them. The
imagej.version property is still set to 2.0.0-beta-7.9, which contains
these components. They will not be obsolete until the component
restructuring is complete and 2.0.0-beta-8 is released.

At that time, we'll bump pom-scijava to 2.0 and remove the obsolete
components.
Release version 1.167

This introduces several new ImageJ components at version 0.1.0.

It also restores support for the soon-to-be obsolete ImageJ components.
They need to remain supported until the ImageJ restructuring is
complete, at which point pom-scijava will bump to version 2.0.