Provide a string::Format function that writes to a span. The snprintf
return value is interpreted and returned as a StatusWithSize.
Change-Id: Ib7fed684dc333d5feaef85c1bb558cb45e3936bd
Introduce functions for outputting numbers as strings. Unlike some
snprintf implementations, these functions support 64-bit integers. Also,
very limited floating point support is provided.
These functions are faster than snprintf and never truncate numbers.
Change-Id: Id5ae06a5d175f15403c34cddb2a077a88be47cf8