Bad commit during debugging.
Adapting code from Android's JsDialogHelper, a private class in the Android source code.
* Adds ln_resources script to generate Blockly symbolic links. * Moves toolbox_standard.js into this directory. Relatedly, updates Android and iOS copy scripts and .gitignore files. * Corrects HTML viewport scale and disallows zoom.
HTML for both demos is now checked in as demos/mobile/html/index.html. Updated android and ios scripts to copy webview.html from above.