Extended StartScript for more args and added StartScriptNamed.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2384 86ba831e-150c-0410-ab35-e06eaae15ed9
Added support for Scroll_Texture_{Left, Right, Up, Down} static inits as Hexen line types 100 - 103 and ExtraData types 406 - 409.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2385 86ba831e-150c-0410-ab35-e06eaae15ed9