furi memory managment (#177)

* memory managment calls now forwarded to freertos heap

* memory managment tests

* local target test compability

* rename heap.c file to heap_4.c for local target and explicity init heap in single thread context

* rebase BlockLink_t struct

* check mutex in local heap

Co-authored-by: aanper <mail@s3f.ru>

core/api-basic/memmgr.h

@@ -0,0 +1,13 @@
+#pragma once
+#include <stddef.h>
+
+// define for test case "link against furi memmgr"
+#define FURI_MEMMGR_GUARD 1
+
+void* malloc(size_t size);
+void free(void* ptr);
+void* realloc(void* ptr, size_t size);
+void* calloc(size_t count, size_t size);
+
+size_t memmgr_get_free_heap(void);
+size_t memmgr_get_minimum_free_heap(void);