Update templates\samples\tests to use ensure viewstart.cshtml and views directory names are cased appropriately #1559

@pranavkm , could you please review this PR??
you didn't apply my comments everywhere.  I usually highlight only the first occurrence or an issue.

noted the following from here to the end of the PR: 
- `<c>Area</c>` -> area
- all paths in `<c/>` elements e.g. `<c>/Views/Home/Test.cshtml</c>`
- rename `RazorViewEngine_VerifyViewLocationFormat()` too