Added building and design descriptions..

Added building and design descriptions to the planet production dialog.

Added scrolling after planet is disselected. Change the scroll speed,
added y axes to scroll speed inclusion to avoid very slow/to fast
scrolling on y axes.
Changed some css for the planet dialog.
Added planet population information to uncolonized planet screen.
Selection is now drawn above planets.
Improved getDesign function to use faster while loop and returning false
if not design is found.
Change some misspelling/typos in buildings.json.