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>

firmware/targets/local/Src/main.c

@@ -1,3 +1,6 @@
+#include "heap.h"
+#include "errno.h"
+
 /*
 Flipper devices inc.
 
@@ -7,5 +10,10 @@ Local fw build entry point.
 int app();
 
 int main() {
+    // this function is not thread-safe, so it must be called in single thread context
+    if(!prvHeapInit()){
+        return ENOMEM;
+    }
+
     return app();
 }