Use require_once in more places

I got:
PHP Fatal error:  Cannot redeclare file_notice() (previously declared in /etc/inc/notices.inc:55) in /etc/inc/notices.inc on line 91
So there are places that notices.inc gets require() when already required.
Use require_once in more places
Use require_once in more places
Use function_exists test
Use function_exists test
Add "match" to floating rules

Add "match" to floating rules as proposed in the forums
https://forum.pfsense.org/index.php?topic=76611.0
Remove Windows Thumbnail cache files
Tidy up "status_captiveportal" XHTML

Add SUMMARY to TABLES
Remove PHP ECHO that isn't in a PHP statement
Update HTML Boolean operator
Add COLSPAN to fill the width of the table
Move NOWRAP to CLASS statement
Close INPUT and IMG tags and add ALT to IMG
Add BODY between HEAD.INC and FBEGIN.INC
Remove TYPE from TEXTAREA, invalid in XHTML
Add closing BODY and closing HTML tags
Tidy up "carp_status.php" XHTML

Add SUMMARY to TABLES
Close INPUT tags and IMG tags and ALT to IMG
Tidy up CENTER tags
Add missing closing FORM tag
Tidy up "status_dhcp_leases.php" XHTML

Add SUMMARY to TABLES
Updates spaces in $fspans and $fspane
Close INPUT and IMG tags and ALT to IMG
Deprecate Ampersand in Anchor tags
Tidy up "status_dhcpv6_leases.php" XHTML

Add SUMMARY to TABLES
Move spaces to $fspans and $fspane
Close INPUT and IMG tags and add ALT to IMG
Deprecate Ampersand in Anchor tags
Tidy up "status_filter_reload.php" XHTML

Close INPUT tags
Remove NAME from DIV tags, not valid in XHTML
Add CDATA section to SCRIPTS
Close IMG tags and add ALT to IMG
Tidy up "diag_ipsec" XHTML

Add SUMMARY to TABLES
Move NOWRAP into CLASS statement
Close INPUT and IMG tags and add ALT to IMG tag
Add dummy row to TBODY but don't display it
Deprecate Ampersand in ANCHOR tag
Tidy up "status_lb" XHTML

Add SUMMARY to TABLES
Update HTML Boolean operators
Close INPUT tags
Tidy up "status_ntpd.php" XHTML

Add SUMMARY to TABLES
Move NOWRAP into CLASS statement
Change TD class to LISTR
Tidy up "status_openvpn.php" XHTML

Add CDATA sections to SCRIPTS
Add SUMMARY to TABLES
Change NAME to ID in TR tags
Closing IMG tags and add ALT to IMG
Add missing closing FORM, closing BODY and closing HTML
Tidy up "status_queues.php" XHTML

Add CDATA sections to SCRIPTS
Add SUMMARY to TABLES
Move NOWRAP into CLASS statement
Update status_captiveportal.php

Add missing closing TD tag
Update status_lb_pool.php

Add missing closing TD and closing TR tags
Update status_lb_vs.php

Add missing closing TD and closing TR tags
Tidy up "diag_logs_filter.php" XHTML

Change "sortableMultirow" to a STYLE
Add missing quotes
Tidy up TD tags
Remove THEAD and TFOOT.
Move NOWRAP into CLASS statement
Add CDATA sections to SCRIPTS