luci-base: move luci.sys.iptparser into separate package

Since commit f6bfac211 ("luci-mod-status: rework iptables status page"),
nothing in luci-base depends on the iptparser class anymore, so fold it
out into a separate package and let the few apps that require it depend
on the new library package.

Saves about 10K uncompressed in luci-base while the iptables status
rework enlarged the markup by roughly 5KB, saving roughly 5KB of size
overall.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

applications/luci-app-splash/Makefile

@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 LUCI_TITLE:=Freifunk DHCP-Splash application
-LUCI_DEPENDS:=+luci-lib-nixio +tc +kmod-sched +iptables-mod-nat-extra +iptables-mod-ipopt
+LUCI_DEPENDS:=+luci-lib-nixio +luci-lib-iptparser +tc +kmod-sched +iptables-mod-nat-extra +iptables-mod-ipopt
 
 define Package/luci-app-splash/conffiles
 /etc/config/luci_splash

applications/luci-app-statistics/Makefile

@@ -8,6 +8,7 @@ include $(TOPDIR)/rules.mk
 
 LUCI_TITLE:=LuCI Statistics Application
 LUCI_DEPENDS:= \
+	+luci-lib-iptparser \
 	+collectd +rrdtool1 +collectd-mod-rrdtool +collectd-mod-iwinfo \
 	+collectd-mod-cpu +collectd-mod-memory \
 	+collectd-mod-interface +collectd-mod-load +collectd-mod-network

libs/luci-lib-iptparser/Makefile

@@ -0,0 +1,14 @@
+#
+# Copyright (C) 2018 The LuCI Team <luci@lists.subsignal.org>
+#
+# This is free software, licensed under the Apache License, Version 2.0 .
+#
+
+include $(TOPDIR)/rules.mk
+
+LUCI_TITLE:=Iptables listing parser class
+LUCI_DEPENDS:=+luci-base
+
+include ../../luci.mk
+
+# call BuildPackage - OpenWrt buildroot signature