Harmonize global keyboardCobntroller() function #183
Description
each and every index.html file should have a "onkeydown" attribute which leads to a function that detects the iframe-depth.
eg. chat in website in browser in window detects the main keyboardController() function in "parent.parent.parent.keyboardController()"
which means a function in tools/general.js is doing that and triggers the main function after program-specific functions are triggered.
function localKeyboardController(event) {
1. do stuff for this current program, eg. arrowLeft/right for imageviewer
2. always send event to parent.keyboardController() by:
detectIframeDepth().keyboardController(event); // or so
}