String::ToWideString wasn't returning a wide string...!

Enabled wide strings for Android ( i'll never target Android < 2.3 ).
EE_MAIN_FUNC is back, it was needed for the Android build ( i forgot about it ).

src/examples/empty_window/empty_window.cpp

@@ -1,6 +1,6 @@
 #include <eepp/ee.hpp>
 
-int main (int argc, char * argv [])
+EE_MAIN_FUNC int main (int argc, char * argv [])
 {
 	// Create a new window
 	cWindow * win = cEngine::instance()->CreateWindow( WindowSettings( 960, 640, "eepp - Empty Window" ) );