adblock-fast: bugfix: better detect ABP lists

adblock-fast: bugfix: better detect ABP lists

* bugfix: better detect ABP lists
* update Makefile with BUSYBOX features dependencies
* update the type of dnsmasq_instance setting
* add error message when file type can't be detected
* add reporting when file type can't be detected
* bugfix: include URL on errors related to URL processing/parsing
* rename resolver function to resolver_config to better reflect its use

Signed-off-by: Stan Grishin <redacted>