Add new conference template

[pshivdare]

Added a new template for conference scenario

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[andosa]

Fixing some typos and improving wording a bit

In this experiment, you will be rating audio quality of conversations where people in a conference room are talking among themselves and with remote attendees (see the figure below). Overlapping speech may occur — this is expected and does not necessarily indicate poor audio quality. In some cases, certain voices may be degraded, missing, or partially lost due to issues such as poor microphone quality, low volume or reverberation, making the audio difficult to understand. Please focus on the clarity and intelligibility of the voices from the perspective of a remote listener. Your ratings should reflect the quality of the audio signal and how well individual voices are captured.

[eindenbom]

The file should be named P804_conference.html.

[eindenbom]

The file differs from P808_multi.html only in one paragraph. We substitute text during template generation instead of making the whole file copy.

[eindenbom]

It seems that the sole purpose of adding a new test type is to change a single paragraph in the HTML template. There should be more efficient way to achieve the same result.

If we still need a new method, then this method needs to be added also to results_parser.py.