issue: Canned Resp Select2 Width

This enhances the Select2 canned response box by making it wider, showing
more text in each line.

issue: Featured FAQs On Disable

This addresses an issue where the client portal shows Featured FAQs on the
sidebar even thought the Knowledgebase is Disabled.

issue: Deleted Field Thread Events (template)

canned: Canned Response Select2 Height

This adds an enhancement to the Canned Response Select2 showing more options
within the list. The length is automatic and is based on how many Canned
Responses you have Enabled.

Limits:
- Height maxes out at 400px so it doesn’t run off the screen

This addresses an issue introduced with `9ab2317e` where the icon for the
event still shows even though we continued and didn’t return the event
description.

This reverts commit 14bcd42d.

issue: IE Select2 Target

issue: Select2 Placeholder Bug

issue: Custom File Upload Dropping

This addresses issue 4155 where editing a ticket using a different session
causes custom file uploads to drop from the ticket.

This addresses an issue where Select2 Placeholders are being cutoff due to a
bug in Select2.

This addresses an issue where Microsoft IE 11 apparently does not like
`event.target` syntax in javascript and breaks the Canned Response Select2.

issue: Deleted Field Thread Events

issue: Priority Field Template Variable

This addresses an issue where deleting a field and all it's data will
delete the form field record in the database causing all events containing
the field to crash the ticket page.

This addresses an issue with PriorityField Template Variables introduced
with 4359 where the priority variable will appear as "Array" instead of the
actual value. This adds an `asVar()` function to `class PriorityField` to
get the appropriate data.

issue: Redactor Select2 Cursor Position

This address an issue introduced with 4311 where selecting a canned response
does not insert it at last cursor position, rather at the top of the text
box.

Reset Button Fix:

This commit makes sure that when the Reset button is hit, we only reset File Upload Field attachments for the specific form we're on.

Ex: Viewing a Ticket as an Agent and switching between 'Post Reply' and 'Post Internal Note'. If you had an image in the Post Reply file upload but switched to Post Internal Note and hit Reset, only the text/attachments on the Post Internal Note tab would be cleared.

(Improves upon #4369)

issue: Client Side Thread Entries

This addresses an issue where the client side thread entries are all grouped
within the same div. This pushes all grouped entries to one side of the page
making them illegible.

issue: jQuery Sortable Redactor

Web Portal Fixes:

- Add space between column headers and sort arrow
- Fix sorting by 'Subject' column
- Fix redactor issues with 'Reset' button
	- Make sure text within redactor is cleared correctly
	- Make sure we don't keep attachments if Reset
- Make sure redactor is reinitialized where needed

This addresses issue 4372 where any Redactor text box within jQuery sortable
is not clickable. This is due to Redactor not being an actual input field,
rather a div, so sortable doesn’t see it as an input.

issue: CLI Deploy Missing Bootstrap Fix

issue: ChoiceField Template Variable

issue: Client Side Column Sorting

This addresses an issue introduced with 4332 where the deploy CLI breaks
upon deploying to an existing location. This checks to see if there is a
bootstrap file in the destination first and if so it uses that one if not
uses the source.

This addresses an issue where client side column sorting does not work at
all. This is due to the if/else statement that checks for a REQUEST sort
order and if the REQUEST sort order matches an `$orderWays` array value. The
if statement returns TRUE for DESC and sets the sort order to DESC as it
equals '-' (a dash) but ASC equals '' (an empty string) so it returns FALSE
which fails-over to the else statement setting the sort order to DESC. In
addition, this adds sorting icons the the column headers to make it more
obvious they are sortable.

This addresses an issue on the forums where osTicket does not add the proper
values to any custom choices field template variable. This adds an `asVar()`
function to `class ChoiceField` so we can return the proper values for the
template variables.

issue: Installer Footer Copyright

issue: TextThreadEntryBody Sanitize

This addresses an issue introduced with a3d896c8 where TextThreadEntryBodies
are not keeping their new line characters causing the email format to appear
wonky. This balances the entry and then htmlchars it to ensure no XSS.