Removed Inconclusive and fixed test cases.

<h4>Summary</h4>
There few Inconclusive test all around the project for several reasons, like few test were marked for Deprecated or Not Ported Nodes, few were for missing Assertions. As a part of fixing defect http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3830, I have gone through all tests and removed Assert.Inconclusive.

<h4>Solution</h4>
Removed Assert.Inconclusive from most of the test case. Fixed few test cases which were failing after removing Assert.
Update one Dynamo file foe TestStringCase_normal which was having no version info and that file was not opening in 0.6.3 as well. In 0.7.1 it was showing String.ChangeCase as deprecated, so re created file in 0.6.3. Now this test is passing.

**Removed** Test cases for **List.Smooth** as we deprecated this node.

<h4>Reviewer</h4>
@ikeough, @sharadkjaiswal, @lukechurch