[Polish] Update Stream Editor views to new standard.

[JoelHer]

Area of improvement

StreamView/StreamPreview
StreamEditor/Overview
StreamEditor/Parser
StreamEditor/OCR Engine
StreamEditor/Source

Describe the improvement

The previously mentioned views need to be updated to the new UI style implemented in the Scheduling tab of the Stream Editor

Why does this matter?

It makes the UI more consistent and cleaner overall.