Malfind : -A and -C added, -W modified

Added:
* '-A' for searching both process & kernel memory in one run of the
plugin
* '-C' for case insensitive YARA searches
* '_scan_kernel_memory() & _scan_process_memory() to YaraScan class due
to the new '-A' switch

Modified:
* '-W' not adds 'ascii' to YARA rule so both are searched when WIDE is
chosen