task manager and major memory stability fixes

src/kernel/userland/libc/stdlib.c

@@ -292,8 +292,7 @@ char* getcwd(char *buf, int size) {
 }
 
 void sleep(int ms) {
-
-    (void)ms;
+    sys_system(46, ms, 0, 0, 0);
 }
 
 void exit(int status) {

src/kernel/userland/libc/syscall.h

@@ -68,6 +68,9 @@
 #define SYSTEM_CMD_DNS_LOOKUP 37
 #define SYSTEM_CMD_SET_DNS 38
 #define SYSTEM_CMD_NET_UNLOCK 39
+#define SYSTEM_CMD_PROCESS_LIST 44
+#define SYSTEM_CMD_GET_CPU_MODEL 45
+#define SYSTEM_CMD_SLEEP 46
 #define SYSTEM_CMD_SET_RAW_MODE 41
 #define SYSTEM_CMD_TCP_RECV_NB 42
 #define SYSTEM_CMD_YIELD 43
@@ -113,6 +116,13 @@ typedef struct {
 int sys_list(const char *path, FAT32_FileInfo *entries, int max_entries);
 int sys_get_file_info(const char *path, FAT32_FileInfo *info);
 
+typedef struct {
+    uint32_t pid;
+    char name[64];
+    uint64_t ticks;
+    size_t used_memory;
+} ProcessInfo;
+
 // Network API
 typedef struct { uint8_t bytes[6]; } net_mac_address_t;
 typedef struct { uint8_t bytes[4]; } net_ipv4_address_t;