This handler should be unnecessary on most versions of Android, and it's currently just swallowing events that would be handled by default. Removing it to let the system take the default action.
* 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.