Improve metadata handling of profiles

Also, improve OS profile handling

process/process_windows.go

@@ -7,10 +7,8 @@ import (
 	"github.com/safing/portbase/utils/osdetail"
 )
 
-// IsKernel returns whether the process is the Kernel.
-func (p *Process) IsKernel() bool {
-	return p.Pid == 4
-}
+// SystemProcessID is the PID of the System/Kernel itself.
+const SystemProcessID = 4
 
 // specialOSInit does special OS specific Process initialization.
 func (p *Process) specialOSInit() {