Adding swipable sidebar

* Login to mobile version to enable sidebar
* Swipe right to display your old dashboard
* Modified `home.inc.php` to default to news at all times again
* Modified sidebar implementation to change via config setting
* Modified mobile navigation bar and header
* Added `sidebar_prop.tpl` file for both themes

Some breaking changes might be introduced here if you are running your
own template implementation. Please ensure that `home/default.tpl` will
display the news posts. `sidebar.tpl` is now `sidebar_prop.tpl`.

If the files are missing you will get a PHP error. Check your logs what
file is missing and create them from my original samples.

Fixes #283