Apply H264 SDP fmtp parameters: max-fs, max-mbps, max-br

[nanang]

Related issue:

• when sending resolution in default codec param is higher for remote profile-level, scale it down but try to maintain the aspect ratio
• when decoding resolution in default codec param is lower than local profile-level, adjust it, note that this param is used by rendering video device to allocate buffer, so it must be set to the maximum
• normalize encoding/decoding bitrate.

[nanang]

In 4361:

Close #1622: Apply H264 SDP fmtp parameters: max-fs, max-mbps, max-br.

[nanang]

In 4362:

Re #1622: fixed bad default aspect ratio.