[lib][console] move the state of the console into an object

This will allow in the future multiple instances of it to be active at
at a time. Place the current console in a new TLS slot per thread so
threads created as a side effect of console commands can properly run
commands.

kernel/include/kernel/thread.h

@@ -48,6 +48,9 @@ typedef int (*thread_start_routine)(void *arg);
 
 /* thread local storage */
 enum thread_tls_list {
+#ifdef WITH_LIB_CONSOLE
+    TLS_ENTRY_CONSOLE, // current console
+#endif
 #ifdef WITH_LIB_UTHREAD
     TLS_ENTRY_UTHREAD,
 #endif

kernel/thread.c

@@ -202,7 +202,7 @@ thread_t *thread_create_etc(thread_t *t, const char *name, thread_start_routine
     /* save whether or not we need to free the thread struct and/or stack */
     t->flags = flags;
 
-    /* inheirit thread local storage from the parent */
+    /* inherit thread local storage from the parent */
     thread_t *current_thread = get_current_thread();
     int i;
     for (i=0; i < MAX_TLS_ENTRY; i++)