TEIIDDES-1848 Preview fails after manual undeployment of the preview vdb
Merge pull request #235 from mdrillin/TEIIDDES-1848

TEIIDDES-1848
TEIIDDES-1845 remove embedded help plugin
TEIIDDES-1835 Added "Clear Preview Artifacts" action to Teiid server action list
TEIIDDES-1837 Added hidden project and non-modeler project checks
TEIIDDES-1840 fixed isValidSelection() logic
Merge pull request #236 from mdrillin/8.2.x

TEIIDDES-1826 Designer doesn't yet support Flat File Connection Profile URL input option