Switches the main parsing function for RtcEventLogs to take an istream instead of a file pointer. Adds wrappers that accept either a string or a filename.
Review-Url: https://codereview.webrtc.org/2253943006
Cr-Commit-Position: refs/heads/master@{#13852}
Changed rtpdump converter and neteq tool to use new parser, but still aborting if the file is corrupt.
Review-Url: https://codereview.webrtc.org/1768773002
Cr-Commit-Position: refs/heads/master@{#12714}