*Title: Simplified way to upload files/images etc. as objects

*Incentive:
Make it much easier to add new files, images, videos to the content
tree. Currently the user has to create a new object of a given class
that supports files then upload that file.

The system must provide a way to detect the file type and pick the
class from that. It should also be possible to place the objects
automatically by the file type or by specifying it in the form.

*Documentation:

INI settings for Action:
The system will look for an INI group with the name of the action.
The action group can contain these settings:

- NavigationPartIdentifier
This controls the navigation part to use for the page.

- ParentNodes
An array with locations for the new object.
Each entry is either an alias or the node ID.
Aliases can be defined in the AliasList variable at the top of this file
or one of the system defined aliases can be used.
The system defined aliases are:
- content
- users
- media
- setup


XHTML Form:
To start the upload process from a form you need to first set the form
to go to content/action and then make sure you have a submit button
with the name UploadFileAction.
You will also have to decide on an upload action name which is configured
in upload.ini, the action can control various things such as placement.

Example:
<input type="hidden" name="UploadActionName" value="BugFileUpload" />
<input type="submit" name="UploadFileAction" value="Upload" />

If you wish to control where the object is placed you can pass the
UploadParentNodes post variable. This can either be single numeric
value denoting the parent node ID or an array of node IDs.

Example:
<input type="hidden" name="UploadParentNodes" value="5" />

By default the upload will redirect to the newly created object, however
it is possible to change that.

To redirect back to the current URL you can supply the UploadRedirectBack.
If you set it to 1 it will redirect back to the last view page, if you
set it to 2 it will redirect back to the last page no matter what type.
Any other value will not set a redirect URL

Example:
<input type="hidden" name="UploadRedirectBack" value="1" />

To redirect to a given place you can supply the UploadRedirectURI variable.
The contents of it will be used as the redirect URL.

Example:
<input type="hidden" name="UploadRedirectURI" value="setup/cache" />