Add xrManagedApi library project and initial xrCore API.
Rename /wrappers/ -> /core/.
Move Core class into XRay::ManagedApi::Core namespace.
Make Core class abstract sealed.
Add IReader and IWriter managed wrappers.
Fix include path.
Remove 'Mixed platforms' and 'Any CPU' platforms.
Change runtime library to MTD.
Add missing constructor and fix access modifiers.
Change runtime library to MTD (for NVTT and xrDXT).
Change runtime library to MTD (for xrLC_Light).
Export classes required for xrPostProcessEditor, merge duplicated code.
Fix missing headers in xrWeatherEditor.
Tweak includes.
Add managed wrappers for post-process classes.
Fix incorrect virtual method overriding.
Remove duplicated code.
Fix missing project files.
Add new binaries to xrbinup.cmd.
Add xrManagedApi reference and basic xrCore initialization.