Move string functions/utils from HAL to std/string

kernel/proc/proc.h

@@ -10,6 +10,7 @@
 #include "sysdefs/proc.h"
 #include "sysdefs/time.h"
 #include "dev/dev.h"
+#include "std/string.h"
 
 #define PROC_NAME_MAX 0x100
 
@@ -90,7 +91,7 @@ void proc_kill(Proc *proc);
 #define PROC_ARG(proc, str) \
   do { \
     ProcArg *__arg = dlmalloc(sizeof(*__arg)); \
-    hal_strcpy(__arg->string, (str)); \
+    strcpy(__arg->string, (str)); \
     LL_APPEND((proc)->procargs.list, __arg); \
     (proc)->procargs.len++; \
   } while(0)