kitten-scientists: add BonfireTab for buildings
kitten-scientists: add BonfireTab for buildings

The BonfireTab just has a function to get a building button. Should be
used to return the exact button, so that we can perform arbitrary actions
in the build tab.

Signed-off-by: Jacob Keller <74ec1f46a68d238888726a00aa611ba6343172e2@gmail.com>

cameroncondry/cbc-kitten-scientists,jacob-keller/kitten-scientists,rdancer/cbc-kitten-scientists,oliversalzburg/cbc-kitten-scientists,oliversalzburg/cbc-kitten-scientists,oliversalzburg/cbc-kitten-scientists