sets border-radius to 2px on form.create_challenge
updates style of utilities div and adds 'Tools' header
changes restore/cancel button text to just 'Cancel' or 'Restore' on GameBackupList
Revert "updates style of utilities div and adds 'Tools' header"

This reverts commit 64f3c307de2a588f0251cf49936a28217ec0b003.
Revert "sets border-radius to 2px on form.create_challenge"

This reverts commit 9636802357798f840a652b1b709db265a73b7b05.
refactors pages in Lightsquare to keep track of what the current page (HomePage etc) is and call
show and hide on it when changing pages
moves challengeList start/stopUpdating calls to HomePage show/hide methods in Lightsquare
removes ChallengeList from Lightsquare and instantiates it in HomePage instead
adds empty show, hide and remove methods to GamePage
adds empty remove method to HomePage
checks for show, hide and remove before calling them on pages in Lightsquare