New Debugger and More
- Replace "ipdb" with an upgraded "pdb" debugger.
--> a6822e9
--> This resolves #1615 - Remove deprecated browser capabilities.
--> 408e037 - Fix issue with taking screenshots in headless mode.
--> b8a0463
--> This resolves #1616 - Time optimizations for different modes.
- Better handling of multithreaded tests.