Assistant interface for mobile devices

[ameshkov]

We should have a single code-base for mobile devices.

For instance, iOS currently partly reuses assistant's code, it would be much easier if it was re-using it completely.

[ameshkov]

Unlike the desktop app, the only functionality we need on mobile devices is selecting and blocking an element.

So, we need a new simplified API to be used without a script host.

var adguardAssistant = (function() {
    return {
        start: function(callback) {}
    }
})();

• start starts selecting an element.
• callback(ruleText) is called when user clicks "Block"

[ameshkov]

You should also add a sample of the mobile assistant initialization to tests.

[ameshkov]

<script src="path_to_mobile_assistant"></script>
<script>
adguardAssistant.start(function(ruleText) {
    console.log(ruleText);
});
</script>

[ameshkov]

Issues with the current implementation:

1. There should be no AG button and no settings
2. Dialog windows are too large