move stb_image/stb_image_write.cpp into a cpp file instead of random files with the magic 'STB_IMAGE_WRITE_IMPLEMENTATION' define

move setup.py back to eglRenderer extension, use pkgutil.get_loader('eglRenderer').get_filename()
disable dlmopen by default, unless B3_USE_DLMOPEN is defined.

examples/OpenGLWindow/premake4.lua

@@ -25,9 +25,12 @@
 			"*.h",
 			"OpenGLWindow/*.c",
 			"OpenGLWindow/*.h",
-			"OpenGLWindow/GL/*.h"
+			"OpenGLWindow/GL/*.h",
+			"../ThirdPartyLibs/stb_image/stb_image_write.cpp",
 		}
 
+		
+		
 		if not os.is("Windows") then 
 			excludes {  
 				"Win32OpenGLWindow.cpp",