Feature Request: Auto-delete matching parentheses when pressing backspace.

[chickensalt]

For example, take this scenario:

Cursor = |

Before: sin(|)
(Backspace is pressed)
After: sin|)

It would be nice if pressing backspace could also delete the matching parenthesis, like this:

Cursor = |

Before: sin(|)
(Backspace is pressed)
After: sin|

Edit: It would also be nice if when pressing the ) key when the cursor is next to the closing parenthesis for the cursor to be moved right instead of adding another ), like this:

Cursor = |

Before: sin(|)
( `)` is pressed )
After: sin()|

Instead of the current behaviour:

Cursor = |

Before: sin(|)
( `)` is pressed )
After: sin()|)

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