sigc++ linked for linux
using system freetype lib on linux
tiny xml add linux
added more linux libs
gui event fix in progress..
fix window, env on_event funcs

Signed-off-by: serengeor <serengeor@gmail.com>
few fixes for some events passing wrong caller
window set to not visible instead of removing from gui env. when close button is pressed.
edit box, delete key support
fix edit box delete key