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

This is one of the last major hurdles to make osTicket fully translatable.
With the advent of 1.7.0, database migration is based on the MD5 hash of the
install SQL file. Therefore, the install SQL script cannot be modified (ie.
translated) or else the system cannot be migrated, since the MD5 hash will
no longer match up.

This patch pulls initial data out of the install file so that it can be
translatable. Eventually the install worksheet can allow a drop-down box of
the default system language. The default data from that language will be
loaded into the system.

We should move initial data out of the install SQL file, which will make way
for a few things:

  * Internationalization -- which breaks the migrater model currently.
        Moving the data outside the install script makes it translatable
        without changing the SQL hash
  * Review -- Migrations which add more data don't highlight new features
        that need review to the adminsitrator

Uses a seven step procedure:
  1. (user) Fails to login twice or more
  2. Clicks the 'Forgot my password' link on the login form
  3. Submits the username or email address and triggers a password-reset
     email
  4. Clicks the link in the email and is directed back to the reset page
  5. Enters the username or email again and is logged in
  6. Password change is forced, but current password is not required
  7. Password is updated, user can continue the session without
     authenticating again

Spelling, grammar and readability in upgrader documents
  - Tweaked spelling, grammar and wording to make the text of the upgrader
    pages more readable.
Fixed spelling regression
  - Higly —> Highly
Spelling and readability fixes for /include/class.* files
  - Fixed some spelling mistakes
A couple more spelling/readability fixes.
  - More fixes

Change the config table from a column-based table to a key-value table
with namespacing. This allows several parts of osTicket to store their
respective configurations in the same table without requiring database
structure updates

'namespace' is reserved in PHP

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