Added STL mesh file format reader and writer. This is a pretty simple format, but I wanted to try the mesh writer interface.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@983 dfc29bdd-3216-0410-991c-e03cc46cb475
all devices now log an error message if the video driver is unknown.
fixed serialization of new variables in IGUIEditBox.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@750 dfc29bdd-3216-0410-991c-e03cc46cb475