Atomic float op + slang RT compilation

[Jaisiero]

• Optional atomic float op.
• Slang RT minimum code to compile with RAY TRACING flag (not supported yet).

[Ipotrick]

I merge after the prefix is added

[GabeRundlett]

Note, as device.h and device.hpp just had a different feature made optional, in master the device flag 1 << 11 is already used.

[Jaisiero]

What do you mean by prefix? the flags were fixed

[Ipotrick]

I was tired reading this there is nothing wrong with what you did