r9635: Seperate window logic from registry js file.

r9635: Seperate window logic from registry js file.
This allows for flexibility in display format,
which will make more sense when I start working
on windows, tabs, etc.

Add the beginnings of a document.js object that allows
us to add and remove scripts as we use them, which will
ensure we only load what we need.  A desktop GUI runs
from a single page, so we can't load js files by changing
pages.

deryck
(This used to be commit b4f6f81d7bbf87fcb7c7c9bd4a7164aabaeedc1c)