app: Minor code reformatting
as_root: Added error handling, safety checks

NOTE: Now only able to manipulate files in "/tmp/" and
      "/Library/Logs/CrashReporter/".
app: CrashLog's delete now returns YES upon success
app: Refactored deletion of log groups
app: Merged directory reader class into CrashLogGroup
app: Order crash log groups by name
as_root: Added "copy" command
app: Added copy_as_root()
as_root: Was passing wrong args to rename()
monitor: Added sanity checks
Removed arm64 slices for all except monitor

NOTE: arm64 version of libsymbolicate does not yet work properly.
pkg: Updated libsymbolicate dependency
app: If log file is owned by root, copy to temp path to symbolicate