VGC OTS per Robson Bittencourt

This extension is a fork of OpenTeamsheetGraphic, an excellent idea by @RobinsonCzajkowski.

The main purpose of this fork is to display the Open Team Sheet above the chat log in a fixed manner, making the OTS panel constantly visible.

This version also features several differences from the original:

The code has been rewritten to improve maintainability.
Visual improvements have been implemented.
All sprites are now working.
The original OTS display is replaced by this extension.