Generate ls2 role file for each native application on startup

Signed-off-by: Simon Busch <morphis@gravedo.de>
Ask memory monitor before launching a new native app

Signed-off-by: Simon Busch <morphis@gravedo.de>
Bring back most of the old memory monitor implementation

Currently only a memchute replacement is missing to watch the global system memory usage.

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