VGC OTS

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.