fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Longest package titles are not shown in the menuconfig,
which decreases manuconfig usability.

Shorten some of the longest titles.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

slide-switch translates slide switch position changes into normal button
presses and releases for OpenWrt / LEDE devices.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>