# Functions
ContextGetSpan() extracts a span Factory from the passed-in Context and returns it (or 'nil').
ContextStoreSpan() adds a span Factory to the passed-in Context, returning the new, decorated Context.
FinishSpan() calls Finish() on the passed-in 'span', unless it is 'nil'.
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IsValidTraceID() returns 'true' only if 's' is a non-zero hexadecimal value of 32 digits.
NewROSpan() returns an empty Factory.
NonHexIndex() returns the offset to the first character in the string that is not a hexadecimal digit (0..9, a..f, A..F) or -1 if none.
# Constants
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# Variables
HexChars is a 256-bit value that has a 1 bit at the offset of the ASCII values of '0'..'9', 'a'..'f', and 'A'..'F', the hexidecimal digits.
# Structs
ROSpan implements Factory but only deals with Import()ed spans, thus requiring no access to GCP CloudTrace libraries.
# Interfaces
Factory is an interface that allows Spans to be created and manipulated without depending on the GCP CloudTrace module (and its large list of dependencies).