kernel: separate headers into kernel and user headers

all kernel headers have been moved from include/mango to include/kernel
and include definitions that are only relevant to kernel-space.

any definitions that are relevant to both kernel- and user-space
(i.e. type definitions, syscall IDs) have been moved to
include/mango within libmango.

arch/user/cpu.c

@@ -1,5 +1,5 @@
 #include <unistd.h>
-#include <mango/machine/cpu.h>
+#include <kernel/machine/cpu.h>
 
 int ml_init_bootcpu(void)
 {

arch/user/hwlock.c

@@ -1,5 +1,5 @@
-#include <mango/machine/hwlock.h>
-#include <mango/compiler.h>
+#include <kernel/machine/hwlock.h>
+#include <kernel/compiler.h>
 
 void ml_hwlock_lock(ml_hwlock_t *lck)
 {

arch/user/init.c

@@ -1,11 +1,11 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <mango/init.h>
-#include <mango/memblock.h>
-#include <mango/vm.h>
-#include <mango/object.h>
-#include <mango/printk.h>
+#include <kernel/init.h>
+#include <kernel/memblock.h>
+#include <kernel/vm.h>
+#include <kernel/object.h>
+#include <kernel/printk.h>
 #include <arch/stdcon.h>
 #include <sys/mman.h>
 

arch/user/initcall.c

@@ -1,4 +1,4 @@
-#include <mango/init.h>
+#include <kernel/init.h>
 
 #ifdef __APPLE__
 extern char __start_initcall0[] __asm("section$start$__DATA$__initcall0.init");

arch/user/stdcon.c

@@ -1,10 +1,10 @@
-#include <mango/libc/string.h>
-#include <mango/libc/ctype.h>
+#include <kernel/libc/string.h>
+#include <kernel/libc/ctype.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <mango/console.h>
-#include <mango/vm.h>
-#include <mango/printk.h>
+#include <kernel/console.h>
+#include <kernel/vm.h>
+#include <kernel/printk.h>
 
 static void stdcon_write(struct console *con, const char *s, unsigned int len)
 {