v2.0.0-beta.4

Deployed to: https://python.microbit.org/v/beta

• Term "Partial Flashing" renamed to "Quick Flashing" (#233)
• Add support for an iframe messaging protocol (#246)
• Edit Snippets modal wording and translate table header (#236)
• Disable autocomplete on enter by default (#235) (current default is tab key)
• Update files and modules user docs (#243)
• Highlight the current language in the language menu (#242)
• Add more info about the filesystem in the Load/Save modal (#241)

Fixes:

• WebUSB flashing fixes (#239) (#237) (#248)
• Top buttons are now scrollable on small (mobile) resolutions (#232)
• Fix rendering of the WebUSB modal in IE10 (#238)