cpu: add refresher thread to restore option
memory: add filesystem check

@slugzero mentioned that the ext4-Feature "has_journal" might not be
enabled for all devices. This commit introduces a popup dialog in the
memory fragment, if the system hasn't got this feature enabled for the
/data partition and also suggests the user to run the following command
in recovery;
tune2fs -O has_journal /dev/block/mmcblk1p25

This patch fixes also the remount-Method used for zcache, so zcache
should work now.
fix typos