Feature/webgui ops (#723)

* Update node packages, download nodejs in build process, start server from openspace process
  * Patch CEF cmake automatically
  * Build webserver automatically
  * Work on CMake for WebBrowser, Webgui and CefWebGui
  * Map key modifiers to CEF
  * Smooth time interpolation in webgui
  * Automatically focus on search field in filter lists
  * Move webgui code to external repositories
  * Use asset system to distribute webgui
  * Remove webgui from main repository
  * Add support for right click in webgui and improve timetopic
  * Resolve cmake policy warning
  * Add relative time interpolation to lua interface
  * Sanitize json error message before logging error. Workaround for #736
  * Added gui properties to scene graph nodes
  * Add version topic
  * Add shortcuttopic
  * Add ability to disable rendering of cefwebgui
  * Don't do message loop work if there is no browser.
  * Set correct path to nodejs on unix
  * Message loop work in presync
  * modifications for shortcuts in gui, added names for shortcuts
  * Set properties via lua scripts
  * Allow gui grouping for shortcuts
  * Add gui paths keybindings
  * Blocking keyboard callbacks when webgui has keyboard focus in an editable field
  * Allow disabling of WebBrowser and CefWebGui
  * Make it possible to hide GUI
  * Get rid of redundant dashboard items if web gui is used
  * Hide WebGUI on slave nodes
  * Hide WebGUI on main rendering window if a GUI window exists
 * Enable WebGUI on default unless it is overwritten in the openspace.cfg
  * Add guiName for propery owners in socket api

modules/cefwebgui/include/guikeyboardhandler.h

@@ -0,0 +1,46 @@
+/*****************************************************************************************
+ *                                                                                       *
+ * OpenSpace                                                                             *
+ *                                                                                       *
+ * Copyright (c) 2014-2018                                                               *
+ *                                                                                       *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
+ * software and associated documentation files (the "Software"), to deal in the Software *
+ * without restriction, including without limitation the rights to use, copy, modify,    *
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
+ * permit persons to whom the Software is furnished to do so, subject to the following   *
+ * conditions:                                                                           *
+ *                                                                                       *
+ * The above copyright notice and this permission notice shall be included in all copies *
+ * or substantial portions of the Software.                                              *
+ *                                                                                       *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
+ ****************************************************************************************/
+
+#ifndef __OPENSPACE_MODULE_CEFWEBGUI___GUI_KEYBOARD_HANDLER___H__
+#define __OPENSPACE_MODULE_CEFWEBGUI___GUI_KEYBOARD_HANDLER___H__
+
+#include <modules/webbrowser/include/webkeyboardhandler.h>
+
+#include <ghoul/opengl/ghoul_gl.h>
+#include <memory>
+
+namespace openspace {
+
+class GUIKeyboardHandler : public WebKeyboardHandler {
+public:
+    GUIKeyboardHandler();
+    virtual ~GUIKeyboardHandler();
+
+private:
+
+};
+
+} // namespace openspace
+
+#endif // __OPENSPACE_MODULE_CEFWEBGUI___GUI_KEYBOARD_HANDLER___H__

modules/cefwebgui/include/guirenderhandler.h

@@ -37,6 +37,7 @@ namespace openspace {
 class GUIRenderHandler : public WebRenderHandler {
 public:
     GUIRenderHandler();
+    virtual ~GUIRenderHandler();
 
     void initializeGL();
     void deinitializeGL();