Moved repository to new location

- Updated author name and all links.

README: Link to the final, new scripts

README: Add link to JavaScript developer modules

Modules/SelectionMenu: Callbacks get action name

- All callbacks now receive the name of the triggered action. This
  helps you easily register the same function for multiple callbacks.

  Callback action names are: `Menu-Show`, `Menu-Hide`, `Menu-Left`,
  `Menu-Right`, `Menu-Open`, `Menu-Undo`.

Modules/SelectionMenu: Allow specifying font alpha

- You can now configure the font transparency (alpha) of the menu. The
  range is from `0.0` (invisible) to `1.0` (fully visible).

Modules/SelectionMenu: Add support for object-items

- Previously, you had to define every menu option as a simple string. To
  attach special information which you wanted later, you either needed
  to store the option offset yourself and compare it to some other array
  where you kept your extra data, or you had to somehow embed the data
  in the string and then extract it later.

  This commit gives you a better solution. You can now use object-based
  option items. In that case, you simply have to define an object which
  MUST have the `menuText` key. All other object keys can be anything
  you want. But you should never create any keys with `menu*` in the
  name, since the menu will always use that prefix for any future
  extensions/special object keys.

Example of an object-based option:

```
var menu = new SelectionMenu();
menu.setCallbackMenuOpen(function(){ dump(menu.getSelectedItem()); });
menu.setOptions([
    'An old-school string-based option',
    {
        menuText: 'An object-based option',
        somethingExtra: [ 1, 2, 3 ]
    }
]);
menu.renderMenu();
```

The example dumps the selection to the terminal whenever you press
enter (the default "Open" key) on a menu selection. So be sure to run
mpv from your terminal, such as with `mpv --idle --force-window`.

It uses both string-based and object-based options for demonstration
purposes, but you are actually also allowed to do that in your real code
if you want to. The `getSelectedItem()` method will return the entire
selected value. In case of a string option, it returns the string. In
case of an object-based option it returns the whole object.

As you can see, this new feature makes it very easy to embed advanced
data within your options tree.

Backbox: Rename to Blackbox

- The new name was suggested by a user who mistyped the name of this
  project. It seems like a very good idea to rename it to that similar
  and much more recognizable word _now_, to avoid any future confusion
  as the project grows. The name "Blackbox" makes a lot of sense and
  nicely fits the "swiss army knife playlist/file manager" idea behind
  this project.

- You'll have to update your input.conf bindings to `Blackbox*`. And if
  you are using a custom script config, simply rename your existing
  config file to `script-settings/Blackbox.conf`.

Add script-settings/Leapfrog.conf.example

Backbox: Add support for playlist item titles

Closes VideoPlayerCode#3.

- Certain imported playlists, such as M3U files, can sometimes contain
  extra title metadata about each playlist item. We now read that title
  if available. Regular playlists show the filename/URL of the item
  as usual. But if a title is available, we'll now show that instead.

Backbox: Update to new Options module usage