This fixes an issue where the PK of ThreadEntry will be NULLed in the
following code

```php
$entry = ThreadEntry::create(array(...));
$entry->save();
$entry->email_info = new ThreadEntryEmailInfo(array(
    'mid' => 'xyzAbc',
));
```

In the above code, the $entry->__set('email_info', <ThreadEntryEmailInfo>)
would be invoked. The ThreadEntryEmailInfo object is new, and so will cause
the local part of the relationship (`id` in this case) to
become null further down in the `__set` method.

This issue is fixed in this commit by removing the NULL assignment to the
new object. This was added in 11322766,
however, it is unclear why the null assignment is performed.

This commit attempts to remove some of the confusing and redundant code to
attach files to thread entries and replace it with a single code base. It
also attempts to remove and error where a single attachment might be
attached to a new thread entry multiple times.

Lastly, it removes the insert followed by an update for emails with inline
images. This should improve performance processing emails as only one trip
to the database is now necessary for thread entries with inline images.

forms: Fix attachment security merge conflict

Somehow the attachment security checks got duplicated and messed up. Perhaps
it was a bad merge?

orm: Properly quote objects in queries

Date Time Conversion Mojo

Reviewed-By: Jared Hancock <jared@osticket.com>

This fixes a regression in 4f8f236d, where
the parameters are sent in the SQL statement to the database. Objects which
are converted to a string must be propertly quoted when placed in the query.

ORM queries avoiding caching

Reviewed-By: Peter Rotich <peter@osticket.com>

Add year to php to Date Picker (js) translation table

Make sure due date time dropdown display matches the option value.

Stop doing double timezone offset

Simplified executor which uses the mysqli_query() function to process
queries. This method is faster on MySQL as it doesn't require the PREPARE
overhead, nor require two trips to the database per query. All parameters
are escaped and placed directly into the SQL statement.

This executor extends the traditional mysqli_fetch_xxx() methods by casting
non-null numeric field values to PHP numeric types.

This is required because using unbuffered MySQL queries means that no other
SQL queries can be run until the export is finished. Since the Staff model
will lazily query the config table, the queries need to be fetched in
advance.

This adds a new concept to the ORM iteration mechanisms and allows iterating
over very large queries without caching the records neither in the result
set nor in the model cache. It also implies using the mysqli_query() method
rather than the prepared statement model, as unbuffered queries with the
prepared statement system are much slower.

alerts: Do not include the manager with the members

Reviewed-By: Peter Rotich <peter@osticket.com>

i18n: Eliminate duplicate or incorrect texts

Reviewed-By: Peter Rotich <peter@osticket.com>

This pass also makes a stride at adding correct punctuation and making error
phrases consistent.

This is my attempt at removing similar texts from the translator work load.
It also makes an attempt at dropping some misspelled words and works toward
standardizing some phrases.

login: Introduce a more "professional" login backdrop

Reviewed-By: Peter Rotich <peter@osticket.com>

v1.10 rc2++ Bug Fixes

Reviewed-By: Jared Hancock <jared@osticket.com>

php: Support PHP 7, require at least 5.4

Reviewed-By: Peter Rotich <peter@osticket.com>

Bug: Show help topic specific thank-you page

Reviewed-By: Jared Hancock <jared@osticket.com>

Textarea input cleanup

Reviewed-By: Jared Hancock <jared@osticket.com>

This duplicates the custom logo code to allow for custom login backdrops. A
new page is added to the "Company" settings page which allows for management
of the uploaded custom backdrops.

Also, rename other apc_xxx functio to the new apcu_xxx equivalents available
since PHP 5.4.