Fixed loose reading media with attributes in mixed order #141

[jimm98y]

Fixes reading of the following SDP:

v=0
o=- 0 0 IN IP4 127.0.0.1
s=Big Buck Bunny 60fps 4K - Official Blender Foundation Short Film
t=0 0
a=tool:libavformat 62.1.103
m=video 11111 RTP/AVP 96
a=control:trackID=0
c=IN IP4 127.0.0.1
b=AS:893
a=rtpmap:96 AV1/90000
a=fmtp:96 profile=0;level-idx=8;tier=0
m=audio 11113 RTP/AVP 97
a=control:trackID=1
c=IN IP4 127.0.0.1
b=AS:127
a=rtpmap:97 MPEG4-GENERIC/44100/2
a=fmtp:97 profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3; config=12100000000000000000000000000000

Added a second method ReadMediaLoose which ignores the order of the attributes that follow.

[ngraziano]

Thank you.