Allow for type and encoding specification of the message body and better
describe the integration with custom form fields.

Some email clients (names omitted to protect the innocent) advertise the
encoding as us-ascii when iso-8859-1 was really implied. This patch allows
the two charsets to be interchangable.

Process inline attachments in thread entry and support inline images in
piped emails

Support inline images across the system, with draft support

Migrate to a single attachment table
    That way we don't need a new table for everything we need to attach an
    inline image to (like a signature, for instance)

Add richtext support for internal notes

Implement images on site pages

* Image paste in Redactor
* Make non-local images optional
* Placeholder for non-local images
* Fix local image download hover
* Don't re-attach inline images

Previously, filenames specified in email headers fetched using the PHP imap
extension were not decoded properly. Specifically, if RFC5987 was used to
encode the filenames, no decoding was performed at all.

This patch properly detects the filename attribute, using a decoding scheme
for RFC5987 if the attribute was encoded properly.

References:
http://osticket.com/forums/showthread.php?t=6129

The administrator can define pages in the admin panel defined as type
'other', and when set to active, those pages can be served from the
/pages/<page-name-slug> URL from the base of the helpdesk.

This is mocked up only against Apache

- Handle decoding large base64 encoded attachments better
- Avoid transcoding from one charset to the same
- Avoid encoding attachments without a declared charset

If the body of an email message is written and encoded with an unrecognized
charset (like 'iso', for instance), then use the original text, assumed to
be 8-bit encoded. This patch will create idiosyncrasies, where text might be
transcoded to utf-8 incorrectly, but it should eliminate instances where
email message bodies are missing due to incorrect charset labels.

Add method to sanitize rich/html text. Addd html encode/decode methods. Remove html encode on display (encoded text saved in db)

Change href definitions for embedded links in the ticket thread so that the
click will be bounced through a script. This will hide the original referrer
URL where the link originated.