This commit further changes the behavior of getURLParmeter to handle
encoded parameter values and returns the decoded string and improves
behavior for parameters without value and multiple equals and other
similar cases which did not work before. See the comments at
http://stackoverflow.com/questions/1403888/get-escaped-url-parameter for
a list of the issues handled by the updated implementation.

This change does not change the general behavior of the function. Empty
or non existing parameters still return an empty string ('').

This commit changes the behavior of getURLParameter(name) to return an
empty string when the parameter is not set or has empty value. Before it
returned 'null' as string.

setupMainMenu() & setupUserMenu():
Changed click delegate to add the spinner animation only the primary mouse button was clicked without ctrl- or meta-key modifier
Adding mouseup delegate to hide the menu if the middle mouse button was clicked.

Redone #778

Fixed wrong variable assignment when trying to open link in new window.

Added proper handling of primary mouse button click with and without ctrl-/meta-key modifier.
Added handlig of middle mouse button click.

Fixes #616

fixes #22397

fixes #19857

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Added 303 to catch SSO cross-domain redirect in Firefox.

Whenever a user navigates away, all ajax calls will fail with the same
result like a cross-domain redirect (SSO). To distinguish these cases,
we need to detect whether the error is a result of the user navigating
away. For this, we introduce a new flag that will be set in
"beforeunload".

Additional handling was required for false positives in case "beforeunload" is
used (ex: cancelled upload) and the user cancelled the navigation.

This makes it possible to display multiple notifications.
If the options.type is set to "error", it will also add a close button.

host can contain the port (host of http://example.com:1234 is
example.com:1234) while hostname never contains a port. They can however
be similar. If you navigate to http://example.com then both host and
hostname will be example.com.

* Fixed docs
* added getHostName function

Adds a new method `OC.getCurrentUser` to get both the user id and
display name Could be used for a future Js

Which is nicer than an obscure global variable

OC.FilePath has still a valid use case when generating paths to static files what for generateUrl cannot be used for - closes #15604

This changeset allows ownCloud to run with pretty URLs, they will be used if mod_rewrite and mod_env are available. This means basically that the `index.php` in the URL is not shown to the user anymore.

Also the not deprecated functions to generate URLs have been modified to support this behaviour, old functions such as `filePath` will still behave as before for compatibility reasons.

Examples:
http://localhost/owncloud/index.php/s/AIDyKbxiRZWAAjP => http://localhost/owncloud/s/AIDyKbxiRZWAAjP
http://localhost/owncloud/index.php/apps/files/ => http://localhost/owncloud/apps/files/

Due to the way our CSS and JS is structured the .htaccess uses some hacks for the final result but could be worse... And I was just annoyed by all that users crying for the removal of `index.php` ;-)