ExtrasTab/ExtrasToolTabs.cs: update it with all the fixes previously added into ChatTab's ToolTabs.cs.

ToolTabs.cs: just an extra precautionary code, in case new panel is added without color scheme
SkirmishControlTool.cs: add partial support for mission sdd just for completeness.
(Current limitation: it doesn't show any config options inherited from dependencies.)
And some fixes to the crude LUA table reader.

SkirmishControl.cs: fix duplicate sdd mod entry.