Mobile Console improvements

[benhatsor]

Possible console improvements:

• Swipe up on sheet header to expand console sheet
• Display RegExp, Symbols, BigInt, and empty objects in logger (by calling .toString() on them)
• Truncate text (hide the 'show more' action but leave 'copy all' when log text is over 10 MB)
• View and load console code input history
• Expandable objects; JSON viewer
• Capture same-origin iframe logs