Relax fmtp requirement for whitespace after semicolon

[garethsb]

ST 2110-20 requires whitespace after the semicolon within format-specific parameters:

However, RFC 4566 (and RFC 8866) doesn't specify this syntax, and many examples, in both RFCs and SMPTE specs, show semicolon used as separator with no following whitespace.

We relaxed the SDPoker check some time ago... AMWA-TV/sdpoker#6.

Note that this does not accept whitespace preceding the semicolon, partly because I'm lazy and handling trailing whitespace after the last parameter (with no semicolon) is a harder change, and because ST 2110-20 also says no whitespace within the name or value.

[garethsb]

Should we also change this line:

nmos-cpp/Development/sdp/sdp_grammar.cpp

Line 566 in 3a904a3

if (0 != params.size()) s += named_values_converter.format(params) + "; ";

to:

s += named_values_converter.format(params);

i.e. no trailing separator?

ST 2110-20:2022 requires no trailing semicolon, but some readers would argue that ST 2110-20:2017 required it to be present. (I argued for making it optional in the revision but seems like I didn't win that.)

I'll push a commit that makes that change too...

[garethsb]

Note that this does not accept whitespace preceding the semicolon, partly because I'm lazy and handling trailing whitespace after the last parameter (with no semicolon) is a harder change

And now it does both of those, @lo-simon.

[lo-simon]

LGTM