Analyze File fails for large log files

[zolstein]

The Analyze File button runs the following function:

    function loadFile() {

        let logFile = document.getElementById("queryLogFile").files[0];
        if (logFile && logFile != null) {
            msg.innerHTML = "Start Reading file";
            let reader = new FileReader();
            reader.onload = function(e) {
                let text = reader.result;
                msg.innerHTML = "Reading File Finished, start analyzing";
                qan.analyseFile(text);

            }
            reader.readAsText(logFile);
        }
    }

FileReader.readAsText is not designed to read large files. In Chrome, if the file is larger than ~260MB, rather than the file contents it returns an empty-string. Larger files (~2GB, in my usage) seem to just not trigger the onload function. This seems like it should use a reading method that can incrementally stream data from the file, and the analyzeFile method should be changed to allow it to process the file in parts.