We move packages out of core that are not core
(and put them in approprite OE category dirs).
We split openwrt-image-base into openwrt-image-minimal
(core openwrt with network but no gui) and
openwrt-image-base (core openwrt with luci).
We move the non-core images out of core.
Closes https://github.com/kraj/meta-openwrt/issues/11
Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>