Support different HTML for view and edit mode

[ldubost]

It would be nice to support different HTML for view and edit mode. This is necessary for the svgedit webviewer has we want to use completely different code in both cases.

This code in WebViewers.Code would work:

private Map doZip(xcontext, doc, fileName, out) {
    def j = new JsonSlurper().parseText(getPkg(doc, fileName, xcontext));
    def actions = j.get("actions");
    def main = j.get("main");
    def main_view = j.get("main_view");
    def main_edit = j.get("main_edit");
    if (!main) { main = "index.html"; }
    if (!main_view) { main_view = main; }
    if (!main_edit) { main_edit = main; }
    for (Object action : actions.keySet()) {
        for (Object fileType : actions.get(action)) {
            def hm = out.get(fileType);
            if (!hm) {
                hm = new HashMap();
                out.put(fileType, hm);
            }
            def mainpath = (action=="edit") ? main_edit : main_view;
            hm.put(action, URLDecoder.decode(doc.getAttachmentURL(fileName), "UTF-8") + "/" + mainpath);
        }
    }
    return out;
}