adblock-fast: explicitly allowing domains for dnsmasq.servers

New features:
* explicitly add allowed domains on download/allow to the dnsmasq.servers
  config file

Cleanup:
* remove unneeded EXTRA_COMMANDS
* remove unneeded EXTRA_HELP
* remove unnecessary `\n` escapes
* remove unnecessary line breaks from output on download

Optimization:
* simplify is_integer()
* replace long if with case
* more verbose output on download

Signed-off-by: Stan Grishin <stangri@melmac.ca>

net/adblock-fast/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=adblock-fast
 PKG_VERSION:=1.1.2
-PKG_RELEASE:=5
+PKG_RELEASE:=7
 PKG_MAINTAINER:=Stan Grishin <stangri@melmac.ca>
 PKG_LICENSE:=AGPL-3.0-or-later