Removed 'm_' prefix in socket config structs

[maxsharabayko]

CSrtConfig, CSrtMuxerConfig and others as of now are structures.
They allow public access to their members. Members currently have m_ prefix, which is intended to identify private members.

Changes:

• Removed m_ prefix of members in CSrtConfig, CSrtMuxerConfig etc.
• A function returning pointer to char must have a pc prefix instead of pv, therefore renamed pvUDPRcvBufSize() et al to pcUDPRcvBufSize() et al according to Hungarian notation.

const char* pcUDPRcvBufSize() const;

[ethouris]

Consider ^

[ethouris]

Ah, note: this pv prefix in the functions was because it was reporting a "pointer to variable". This has also nothing to do with const char* type - Hungarian notation is not required for functions. I understood you renamed this to pc because you wanted to return a constant value, although AFAIR this is used for both setting and retrieving options, so that doesn't sound correct.