Remove Automap::validate() public method
Automap_Creator: fix the way to register symbols from a PHK package
Remove Automap::min_map_version() public method (use constant)
Rename Automap::is_active() to Automap::id_is_active()
Add CRC field in map files (BC break)

As it makes maps incompatible with V2 maps, V3 maps require a V3 runtime.
CRC is always checked at load time.
Runtime: Add NO_CRC_CHECK load flag