web proxy: move to plugins

[fichtner]

Important notices

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• I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
• I am convinced that my issue is new after having checked both open and closed issues at https://github.com/opnsense/core/issues?q=is%3Aissue

move to os-squid plugin with check for enabled to install the 23.7 meta package on upgrade hook

[fichtner]

Possible leftovers:

% git grep -i -e 'opnsense.*proxy' -e 'squid'
src/etc/lighttpd_webgui/conf.d/extforward.conf.example:## header which is added by Squid or other proxies. It is useful for
src/etc/ssl/opnsense.cnf:nsComment                      = "OPNsense Generated Proxy Certificate"
src/libexec/opnsense-auth:        if (!empty($authProps) && $auth_data['service'] != "squid") {
src/opnsense/mvc/app/controllers/OPNsense/Diagnostics/LogController.php:            case 'squid':
src/opnsense/service/templates/OPNsense/IPFW/ipfw.fw.conf:add 65532 fwd 127.0.0.1,{{ OPNsense.proxy.forward.port }} tcp from any to any dst-port 80 via {{ cp_zone.if }}
src/opnsense/service/templates/OPNsense/IPFW/ipfw.fw.conf:add 65532 fwd 127.0.0.1,{{ OPNsense.proxy.forward.sslbumpport }} tcp from any to any dst-port 443 via {{ cp_zone.if }}
src/www/firewall_nat_edit.php:            if (isset($config['OPNsense']['proxy']['forward']['sslbumpport'])) {
src/www/firewall_nat_edit.php:                $pconfig['local-port'] = $config['OPNsense']['proxy']['forward']['sslbumpport'];
src/www/firewall_nat_edit.php:            if (isset($config['OPNsense']['proxy']['forward']['port'])) {
src/www/firewall_nat_edit.php:                $pconfig['local-port'] = $config['OPNsense']['proxy']['forward']['port'];