Revert "Use "System Events" for request_color()"

This reverts commit 9825e49f421dbe23bf3a6986e10dae292f7df022.

With textmate/textmate@f128304d75333d052a73b200de2addd4eada9cdf this can be reverted.
Revert "Switch to using AppleScript Runner for request_color"

This reverts commit 765cfac73df5765856e935ff46b55fd18a3c045f.

With textmate/textmate@f128304d75333d052a73b200de2addd4eada9cdf this can be reverted.