Revert "Add missing code to allow animation speed change."

This reverts commit 1a3ab0616b1fb43dee2fcb7cc05f5852e7f86885.
Revert "Add ability to change animation speed."

This reverts commit 099703b654e4df69931856c2e909a618874c4b05.
Revert "Change behaviour that prevents modification of MessageBox's text size post-initialization."

This reverts commit 6a7b26f25e633d33bdbc4311f3b216c7de9675d6.
Revert "Allow spooling MessageBox to stop spooling and immediately reveal entire content of current page."

This reverts commit 10c3d137eae4856805b9ddbb053b386651e60dc0.
Revert "Stop tracking custom run scripts."

This reverts commit 064bae240f3f33769856455334b01a06c0bff0eb.