LP1831788 Add EgCoreModule for CommonWidgetsModule, etc.

LP1831788 Add EgCoreModule for CommonWidgetsModule, etc.

Collect core objects into their own module so they may be imported
without requiring task-specific modules to import EgCommonModule, which
provides a lot more than most sub-modules need.

In the case of CommonWidgetsModule, it required access to the
FormatPipe, which is a core object, originally exported from
EgCommonModule.  However, EgCommonModule was overkill for
CommonWidgetsModule and importing it would likely have created other
dependency problems.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>