Add tweet button to drives

[vishalkrishnads]

Fixes #84. This PR adds a Post to X option to the drive view component that lets the user post a drive to twitter/X with the following message:

I went on a pretty chill drive from place_A to place_B in my platform as openpilot drove ~x% of the route with less than y disengagements! Check out the drive at url.

where:
* place_A is the place from startLocation
* place_B is the place from endLocation
* platform is a formatted version of platform
* x is the sum of ((event.data.end_route_offset_millis - event.route_offset_millis) / currentRoute.duration) * 100 for all engage events
* y is the number of engage events plus one.
* url is the current URL

This uses twitter's web intent to write the tweet. As of now, it doesn't seem like images are supported. This option can be found under the Share this route option in More Info.

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