Giving created documentary files their dedicated directory

- new config setting "DOCDIR" to specify
- default is "${STORAGE_BASE}/${OUTDIR}/docs"
Giving pulled config files their dedicated directory

- new config setting "CONFDIR" to specify
- default is "${STORAGE_BASE}/${OUTDIR}/conf"
Storing build.prop in DOCDIR instead of OUTDIR
Pulling additional config files from /system/etc: hosts + gps.conf