v4.2.0

• Update IDE to handle MP 1.23.
• Add support to control USBDBG polling rates.
• Update to OpenMV Firmware v4.5.6
• Fixed frame buffer being hidden bug.
• Fixed popup dialog overlap.
• Update RT1062 recovery wording.
• Fix minor issue with example filtering.
• Add history completer to firmware loading.
• Ensure serial thread exits when IDE is closed.
• Fixed creating MJPEG files from MP4 files.
• Fixed undo/redo history being lost on connect.
• Fixed disabled settings from being loaded.