Fix Mac OS X build script - only sed when there is install target.

Projects using Urho3D as external library may not define any install target, so the attempt to correct CMake generator known issue back fired and caused an error.
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
Set Texture and Material Quality / AF parameters during startup from Engine Parameters.