Tomato cookies expire too quickly

http://www.linksysinfo.org/index.php?threads/tomato-cookies-expire-too-quickly.68435/

@thx @blackwind
DNScrypt-proxy: update to 1.3.0

And:
- add libsodium sources required by dnscrypt-proxy
- add Custom configuration for advanced users
show RA
remove old ppp
Force /64 on RA & also use prefix for DHCP-PD
RSA keylength to 1024 for router cert
Allow ipv6 address ping from gui
6RD GUI
Change of order of nvram vars - previous order cause mksquashfs to segfault!
Typo on previous commit. 6rd prefix length no recalled from nvram but it did at least compile & build correctly
Expose PPPoe variables
64 bit cstats
Implement quiet-dhcp, quiet-dhcpv6, quiet-ra options & GUI
Port of RMerlin fixes to large traffic value overflows in IPTraffic.

https://github.com/RMerl/asuswrt-merlin/commit/966634614bdee0ddfec0caa284f52bf04b617111
https://github.com/RMerl/asuswrt-merlin/commit/b6ea206c4f38e47213b924e4f1fa29b36e81490c
DNScrypt-proxy: update to 1.3.0 cd ...

missing gui changes
add netfilter xt_string support

see discussion at:

http://www.linksysinfo.org/index.php?threads/why-doesnt-tomatos-access-restriction-block-https-websites.45988/#post-197539
Expose PPPoe variables - cosmetics

Add descriptions for new options
Revert Redial time to 10 seconds (for quicker redial 3G connection)
fix escaping of ` in nvram --set mode
http://www.linksysinfo.org/index.php?threads/entware-libpcap-bug-entware-users-should-read.68573/
Future proof ipt_account.c for newer kernels (thanks rmerlin)