gwt 2.7.0

Closes #34424.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
New formula: tippecanoe, a tool for map data processing

This adds a new formula for Eric Fischer's tippecanoe project.
The project depends on protocol buffers and sqlite, takes
GeoJSON as input and produces MBTiles as output.
tippecanoe: add 0.0.0 bottle.