Add STL export.
Edit stl test export.
More test models.
Fix to endloop tag in STL writer.
Add a default facet normal to STL output.
Add vertex flag to STL writer.
Add a library for STL writing. Convert to using binary writer.
Add a normal to STL output.
Try with text writing again.
Added "SnowPeashooter.xml" to introduce 0.5s delay so subsequent test cases pass
Merge pull request #744 from ambarish-prakash/ChocoButterUI

Accepting this to verify the build fix
Revert to the original text based STL method.
Remove the STL library and binary method.
Updated "PauseAfterPlaybackInMs" from 500ms to 2000ms (test timing fix)
Add stadium STL model.
Test diff of stadium model.
Embedded OpenSans Font and create Common Font Variables in DynamoModern.xml
Change current font to Embedded OpenSans for all UI control in DynamoView window

Conflicts:
	src/DynamoCore/UI/Views/DynamoView.xaml
New Dark Theme UI for all control such as Button, Textbox, Checkbox, Dropdown
Implemented PreferenceSettings

Settings that became persistent:
1) Show Console
2) Connector Type
3) Fullscreen Watch Mode

Test cases included