MPU Hal (#1492)

* Furi HAL: memory protection unit
* Core: prohibit NULL dereferencing, even for reads.
* Applications: fix NULL dereference
* Core: stack protection by MPU
* MPU: stack region alignment
* Apps: fix null pointer dereferences
* Threads: fix non-null arg check
* Desktop settings: fix null pointer dereference
* Core: documented null-check hack
* Fix null dereference issues
* Apps: args check
* Core: naming fixes
* format code
* Core: remove NONNULL specifier
* FurHal: move MPU initialization to begining, fix enum naming

Co-authored-by: あく <alleteam@gmail.com>

furi/core/memmgr.c

@@ -36,10 +36,8 @@ void* calloc(size_t count, size_t size) {
 }
 
 char* strdup(const char* s) {
-    const char* s_null = s;
-    if(s_null == NULL) {
-        return NULL;
-    }
+    // arg s marked as non-null, so we need hack to check for NULL
+    furi_check(((uint32_t)s << 2) != 0);
 
     size_t siz = strlen(s) + 1;
     char* y = pvPortMalloc(siz);

furi/core/thread.c

@@ -88,7 +88,7 @@ void furi_thread_set_name(FuriThread* thread, const char* name) {
     furi_assert(thread);
     furi_assert(thread->state == FuriThreadStateStopped);
     if(thread->name) free((void*)thread->name);
-    thread->name = strdup(name);
+    thread->name = name ? strdup(name) : NULL;
 }
 
 void furi_thread_set_stack_size(FuriThread* thread, size_t stack_size) {