issue: Upgrader Wrong Guide Link

This addresses issue 4738 where the Upgrade and Migration Guide link is
incorrect. This updates the link to the new Documentation site.

changelog: 1.10.5

This adds the changelog for 1.10.5 maintenance release

i18n: Fix build language packs for the 1.10.x branch

issue: Translation Flags Not Clickable

This addresses an issue where the second row of translation flags are not
clickable when editing a Form with 23+ languages installed. This adds a
`height` of "auto" so that the entire div fits the flags’ surface area,
making them clickable again.

jq: Update To jQuery-3.3.1

This pull request is wayyyy overdue. This updates jQuery and all related
files to the latest jQuery release (3.3.1). This also adds a new script
called jQuery-Migrate that maintains older functions needed for a few things
(eg. `filedrop.field.js`).

Improve the Staff login

Issue: Tasks Within Tickets

issue: Hide Task Loading Overlay

This addresses an issue where the Loading overlay on Tasks will not
disappear after the request was submitted. This adds two lines to first hide
the "Loading" modal and then toggle the overlay.

issue: Dashboard Export Period

This commit addresses issues we had with viewing Task(s) within a Ticket:

1. When viewing the table of all Tasks on a Ticket, the Options dropdown should only allow the Agent to Reopen or Close the Tasks based on the status of the Tasks.
Ex: If there is only 1 Open Task, you should only see the 'Close' Option
    If there are 2 Closed Tasks, you should only see the 'Reopen' Option
    If there are multiple Tasks in which some are Open and some are Closed, you should see both the 'Reopen' and 'Close' options

2. When viewing an individual Task within a Ticket, the status options were the opposite of what they should have been. Now, if the Task is Open, the Agent will see the option to 'Close' the Task. If the Task is Closded, the Agent will see the option to 'Reopen' the Task.

This addresses an issue where exporting statistics via the dashboard within
a certain timeframe (eg. 07/01/2018 -> One Quarter) will always export the
statistics from the selected date up to today. This is due to the Period
option always being set to "Up to today" when the Export button is clicked
which in return exports the stats from the selected start date to today.
This adds JS to set the period the Agent selects so the Export will return
the stats from the selected date to the selected period.

- Follow the same pattern that the client login https://github.com/pitbulk/osTicket/blob/develop/login.php#L48 . Otherwise StaffAuthenticationBackend that receives a POST are not possible.
- Refresh $msg with the value stored in session if the StaffAuthenticationBackend backend defines it, otherwise the initial "Authentication Required" is prompted.

oops: Remove DST From User Update

This addresses an issue where Users updating their profile will throw an SQL
error in the system logs. This is due to a line of code trying to set a
value for the `dst` column which no longer exists as of `1.10.0`.

issue: Dupe Page Requests Fix

This addresses an issue with pull 4472 where disabling the Submit button
does not submit the Input value for the button. This affects the
installation of plugins, where the Install Path is not sent therefore the
plugin is not installed. This clones the original submit button, hides it,
then displays a dummy disabled Submit button which will submit the value and
prevent dupe posts.

change old wiki urls to new doc urls

Tasks: Task visibility

oops: Class GenericAttachment Not Found

This addresses an issue introduced with 4426 that references an undefined
class.

issue: Duplicate Page Requests

forms: Render Instructions

This addresses an issue where clicking Open, Post Reply, etc. more than once
whilst creating/responding to a ticket will generate duplicate requests.
This causes duplicate responses to be sent out or duplicate tickets being
created. This adds jQuery, on both Agent and User side, to disable the
submit buttons when the "Loading" popup appears so you cannot click the
button more than once.

This addresses issue 4493 where the system renders form instructions as
plain text instead of HTML. The data is saved in the db as encoded HTML and
upon pulling the data we do not decode it back to HTML for rendering.

accessibility: Screen Readable Actions

This improves accessibility by adding screen readable labels to ticket
actions that don’t already have them.

issue: CDATA Phone Contains

forms: Disabled By Help Topic Users

This addresses issue 4470 where Users creating tickets via Client Portal and
failing to fill out a required field makes disabled fields by Help Topic
appear on the page. When the disabled fields appear they allow Users to
populate and save data that they were not meant to submit.