Fix WNDR4300 wireless key functionality 
Sync with openwrt-master

This commit sync ramips from openwrt master, and revert use caldata.sh
so that wireless for some devices can works.

1、Fixed a bug in https://github.com/xtaci/kcp-go/releases/tag/v5.5.5
2、Upgraded scheduler in kcp-go for efficiency, https://github.com/xtaci/kcp-go/blob/master/timedsched.go

This commit sync target ath79 from openwrt master, and revert some commit which will causes wireless to not work.
Use ath10k-ct-smallbuffers by default, so that small memory devices can normal work.

This reverts commit 2289184a.

This reverts commit b7007324.

* opkg: bump to latest git HEAD
Signed-off-by: NCN_SZTL <cnsztl@gmail.com>

* config: add option for opkg

add nfs manage

* kernel: bump to 4.14.167, 4.19.98

* ipq40xx: fix error patch

* bcm2708: sh: use /bin/sh

* kernel: sfp: add Nokia SFP fix from net-next

Network ---> Project V ---> <*> v2ray-core
You can custom the features in "V2Ray Configuration" option.

* v2ray-core:Add v2ray-core self compilation
Network ---> Project V ---> <*> v2ray-core
You can custom the features in "V2Ray Configuration" option.

* luci-app-ssr-plus
0.Add v2ray-core
1.Makefile Standard install
2.Fix vmess v2ray
3.Optimize update scripts
4.Add ad filter (not enabled)
5.Code formatting
6.Clear basic data

* luci-app-ssr-plus:Add ad filter settings UI

* luci-app-ssr-plus:Fix Filter invalid nodes

* luci-app-ssr-plus:update china_ssr.txt

* luci-app-ssr-plus:Fix