Rename var name from <package>_INCLUDE_DIR to <package>_INCLUDE_DIRS.

See http://urho3d.prophpbb.com/topic9.html.
Further fixes and optimizations to View render target pingpong handling. Update Material memory use when modified programmatically.
If window is not resizable, do not maximize it at the default resolution (1024x768) to keep the border intact.
On OpenGL ES 2.0, create depth renderbuffers in explicit GL_DEPTH_COMPONENT16 format, as GL_DEPTH_COMPONENT is unsupported on some devices. Possibly a fix for #140.
For better performance, avoid backbuffer resolve to texture on OpenGL ES 2.0 and instead prefer to render into a texture if the viewport contents need to be read.
Added note of clip plane being unsupported on OpenGL ES 2.0.
Fixed uninitialized default value of Camera's clip plane.
Added Development Base. This sets Debug Information for Debug Builds to /C7 and none on Release Builds. Modifies the install settings and ignore flag as well.
Modified Sound to provide its own unique category for UI sounds