* Add fast single-precision add/sub/mul for Hazard3
* Make test output less noisy. Map -nan to -inf in vector gen. Move random vectors to separate files.
* Re-disable USB stdout for pico_float_test by default...
* Disable pico/float.h exports on RISC-V as these functions aren't implemented
* Add hazard3 instructions to asm_helper. Split hazard3.h to support this.
You can still include hazard3.h to get everything. This just allows you
to pull in less.