OF-839 Forwarded extension should not overwrite extension namespaces of ...

Allow for custom lib and conf file placement. Jira OF-838

Bug: properties in openfire.xml not properly loaded in setup

MUC Service Plugin update to 0.2.1

- Creation and modification dates, are now optional
- Room user roles, are now optional
- Bug fix: As persistent specified room, will be now saved to DB

In setup, some of the host settings are loaded from XML properties specified in openfire.xml, while others are incorrectly loaded from whats currently in JiveGlobals. Since we are in setup mode, JiveGlobals.getProperty returns null thereby ignoring any property overrides in openfire.xml specified by the user.

Changelog: 
1. Instead of just blindly setting anonymous auth to true, check if user has an override property in XML configuration, if not, default to true.
2. Call getXMLProperty to load user configuration override values and not what is currently in JiveGlobals. During setup mode, this is always null.
3. Instead of setting default values for auth, user, group, card, lockout, securityAudit and admin class names, check if the user has provided overrides for those properties, and if so, use those, otherwise use defaults.
4. Expose a method to retrieve XML property names, and then in finishSetup, go through the rest of the XML properties overridden by user that were not touched by setup and individually set those. This is particularly useful when users have to specify primary and secondary * hybrid providers.

OF-834: Close Open_redirect

More S2S fixes

Fix for OF-835

- install ReadThrottleFilterBuilder into filter chains
- adjust SSLFilter positioning in chain so that ReadThrottleFilter works correctly

Kim 'Zash' Alvefur commented that an empty authzid in EXTERNAL wasn't working.

This patch adds this handling, and also changes authorization checks from a
domain.contains() to a domain.equals().

This now reassembles a URL from the path, query, and fragment supplied, and
ignores the scheme and network location portions entirely.

Thus http://www.google.com/foo redirects to /foo only.

Credit to Jonathan Bush, Security Consultant at
ProCheckUp http://www.procheckup.com

Added UTF-8 support for readme and changelog files

Fixed the issue that creates an empty line after each line of HTML code,
which can break the layout by using <pre>

This patch rewritten to avoid reformatting by Dave Cridland <dave@cridland.net>

Double-check removed, streamlining logic.

Jitsi Videobridge: Fixes Jitsi VideoBridge Plugin problem redirects to webrtcrequired.html. See https://community.igniterealtime.org/thread/52934

OF-831: A typo on Database Settings page during setup

MUC Service Plugin 0.2.0

- Extended the service with /participants endpoint to get all room
participants
- Extended the muc service to manage chat room roles (owners, admins,
members, outcasts)

Update user-lockout.jsp

typo prevents custom minute setting

Update registration-props-form.jsp

missing close tag ">"

Quick fix for old-skool Jabber on S2S

MUC Service Plugin. I adding this to complement the User Service plugin.

This cannot be enforced strictly for openfire IQ handlers to process packets for custom namespaces. I am modifying the original fix to exclude IQ handlers and also check for anonymous users.

S2s fixes. Thanks for doing this. I am experimenting with websockets for Openfire s2s and I need these fixes.