Revert "container: remove unnecessary slice copy from Container.Remove"

This reverts commit 75a23c7.

Also update password revealer icon

Updating release date for rc7

Don't add empty transform

Also fix transform property in SVG

Fixes #3900

Preparing another release

Another fix picked in

Updating for an rc2

Cache text texture per-canvas so it matches the OpenGL context

Update for new proposed date