Revert "BBox: Always offset the top border by the same amount"

This reverts commit 39899cf6626bbcb3b41fd44fc49dd2bdec9a34f9.

Checked with BeOS R5, and this is not how it works, to remain
compatable we need to go back to how this was before.
Return the insets to be equal on all sides
Revert to manually offsetting the BBox in BScreen.

Take this opportunity to reapply this hack in a much nicer way.

Before the hack included the default margins, now it doesn't.

Should be back to normal, sorry for the noise.
Update Vision package.

Includes a patch by Humdinger to sentence case various strings in the UI. Thanks!