[FL-1946] RPC App launch (#758)

* RPC: Add App start, lock status
 - Add RPC commands Application start, lock status acquiring.
 - Write tests for RPC App system.
 - Replace Unit Tests application with CLI command. This is for CI needs and for tests that run application.
* Fix NDEBUG build
* Update PB submodule
* Fix RPC print (ENABLE DEBUG PRINT!)
* snprintf -> string_t
* Fix Hard Fault (early mutex free)
* printf -> string_t, format, enable tests
* Update submodule: protobuf
* Applications: rollback unit test naming scheme.

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

assets/compiled/application.pb.h

@@ -0,0 +1,79 @@
+/* Automatically generated nanopb header */
+/* Generated by nanopb-0.4.5 */
+
+#ifndef PB_PB_APP_APPLICATION_PB_H_INCLUDED
+#define PB_PB_APP_APPLICATION_PB_H_INCLUDED
+#include <pb.h>
+
+#if PB_PROTO_HEADER_VERSION != 40
+#error Regenerate this file with the current version of nanopb generator.
+#endif
+
+/* Struct definitions */
+typedef struct _PB_App_LockStatusRequest { 
+    char dummy_field;
+} PB_App_LockStatusRequest;
+
+typedef struct _PB_App_Start { 
+    char *name; 
+    char *args; 
+} PB_App_Start;
+
+typedef struct _PB_App_LockStatusResponse { 
+    bool locked; 
+} PB_App_LockStatusResponse;
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Initializer values for message structs */
+#define PB_App_Start_init_default                {NULL, NULL}
+#define PB_App_LockStatusRequest_init_default    {0}
+#define PB_App_LockStatusResponse_init_default   {0}
+#define PB_App_Start_init_zero                   {NULL, NULL}
+#define PB_App_LockStatusRequest_init_zero       {0}
+#define PB_App_LockStatusResponse_init_zero      {0}
+
+/* Field tags (for use in manual encoding/decoding) */
+#define PB_App_Start_name_tag                    1
+#define PB_App_Start_args_tag                    2
+#define PB_App_LockStatusResponse_locked_tag     1
+
+/* Struct field encoding specification for nanopb */
+#define PB_App_Start_FIELDLIST(X, a) \
+X(a, POINTER,  SINGULAR, STRING,   name,              1) \
+X(a, POINTER,  SINGULAR, STRING,   args,              2)
+#define PB_App_Start_CALLBACK NULL
+#define PB_App_Start_DEFAULT NULL
+
+#define PB_App_LockStatusRequest_FIELDLIST(X, a) \
+
+#define PB_App_LockStatusRequest_CALLBACK NULL
+#define PB_App_LockStatusRequest_DEFAULT NULL
+
+#define PB_App_LockStatusResponse_FIELDLIST(X, a) \
+X(a, STATIC,   SINGULAR, BOOL,     locked,            1)
+#define PB_App_LockStatusResponse_CALLBACK NULL
+#define PB_App_LockStatusResponse_DEFAULT NULL
+
+extern const pb_msgdesc_t PB_App_Start_msg;
+extern const pb_msgdesc_t PB_App_LockStatusRequest_msg;
+extern const pb_msgdesc_t PB_App_LockStatusResponse_msg;
+
+/* Defines for backwards compatibility with code written before nanopb-0.4.0 */
+#define PB_App_Start_fields &PB_App_Start_msg
+#define PB_App_LockStatusRequest_fields &PB_App_LockStatusRequest_msg
+#define PB_App_LockStatusResponse_fields &PB_App_LockStatusResponse_msg
+
+/* Maximum encoded size of messages (where known) */
+/* PB_App_Start_size depends on runtime parameters */
+#define PB_App_LockStatusRequest_size            0
+#define PB_App_LockStatusResponse_size           2
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif