Added improvements for recvlive to make it suitable for performance testing

[ethouris]

This adds a possibility to manage simple options for the program (also for the future) and adds one option -echo quiet that blocks most of the messages printed on stdout that could influence performance.

[maxsharabayko]

The main(..) function of an example application grows by 100 LOC to parse input arguments.
Please move argument parsing logic to a dedicated function so it does not obstruct reading the code related to SRT API calls.

[maxsharabayko]

Better, but still 50 lines in main() that are not directly related to the SRT API usage in the example app.

struct Config {
    Config()
        : opt_quiet(false)
        , service("9000")
    {}

    bool opt_quiet;
    string service;
};

// Not exactly nice to fill Config by reference. Better to return. But for the same of simplicity
// and not catching exceptions in main() should be fine for the example code.
// Returns false on command-line error, true otherwise.
bool ParseOptions(const vector<string>& cmdline_args, Config &cfg);

int main(int argc, char* argv[])
{
    //...
    if (!ParseOptions(args))
        return 1;

[ethouris]

Well, I even like it. The parser function can be even a method ;)

BTW. As per that mutable reference, it was a mistake. Changed to const already.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e0d4227) 67.01% compared to head (5c0f315) 66.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2320      +/-   ##
==========================================
- Coverage   67.01%   66.79%   -0.23%     
==========================================
  Files         103      103              
  Lines       20476    20476              
==========================================
- Hits        13723    13677      -46     
- Misses       6753     6799      +46     

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