www/caddy: Add Layer4 openvpn, winbox and quic matcher

[Monviech]

Adds these:
OpenVPN mholt/caddy-l4#251
Winbox mholt/caddy-l4#255
QUIC mholt/caddy-l4#262

Sample configuration for OpenVPN (generated by template) to compare with sample config of above PR:

{
	layer4 {
		import /usr/local/etc/caddy/caddy.d/*.layer4global

		udp/:8843 {
			@72e3a520-7c15-49de-a4dc-e45ab1cba40a openvpn {
				modes auth
				auth_digest sha256
				group_key_direction normal
				group_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
			}

			route @72e3a520-7c15-49de-a4dc-e45ab1cba40a {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@5b0fd94e-781c-4d48-86f0-a14a5c5c7ad4 openvpn {
				modes auth
				auth_digest sha256
				group_key_direction inverse
				group_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
			}

			route @5b0fd94e-781c-4d48-86f0-a14a5c5c7ad4 {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@88fe930d-75e0-46ec-ae9a-edb1ca19af37 openvpn {
				modes auth
				auth_digest sha512
				group_key_direction normal
				group_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
			}

			route @88fe930d-75e0-46ec-ae9a-edb1ca19af37 {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@1f94e9a6-fb0d-4e33-8e15-ec785a81a09b openvpn {
				modes auth
				auth_digest sha512
				group_key_direction inverse
				group_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
			}

			route @1f94e9a6-fb0d-4e33-8e15-ec785a81a09b {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@de23095e-e808-4c85-8165-57bc0f7db586 openvpn {
				modes crypt
				group_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
			}

			route @de23095e-e808-4c85-8165-57bc0f7db586 {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@9c850be6-4b36-4c3b-b115-ffc2734e64d2 openvpn {
				modes crypt2
				client_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
				client_key_file /var/db/caddy/data/caddy/certificates/temp/1457d018-0f4a-4e46-8efe-1c3549207d69.key
			}

			route @9c850be6-4b36-4c3b-b115-ffc2734e64d2 {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@9666d46d-f9be-4c2b-a87b-077971319aaa openvpn {
				modes crypt2
				server_key_file /var/db/caddy/data/caddy/certificates/temp/b0bf7f56-7a84-4e24-9851-785bedc0b432.key
			}

			route @9666d46d-f9be-4c2b-a87b-077971319aaa {
				proxy udp/192.168.1.1:1195 {
				}
			}
			@72045406-6629-4763-b798-a280777e6ed8 openvpn

			route @72045406-6629-4763-b798-a280777e6ed8 {
				proxy udp/192.168.1.1:1195 {
				}
			}
		}
	}
}