Update enyo, layout and onyx to 2.3.0-rc4

Signed-off-by: Simon Busch <morphis@gravedo.de>
DateTime: adjust for enyo/onyx/layout update

Signed-off-by: Simon Busch <morphis@gravedo.de>
Add initial application plugin

Signed-off-by: Simon Busch <morphis@gravedo.de>
webos-lib: update to latest version

Changes:

f6aa401 CoreNavi: use showing instead of own css style

Signed-off-by: Simon Busch <morphis@gravedo.de>
plugin: implement wifi manager extension

Signed-off-by: Simon Busch <morphis@gravedo.de>