RPC: Screen streaming & Input injection (#794)

* RPC: Screen stream
* Move callback to rpc_screen, implement graceful stop
* RPC: Implement input injection
* Update protobuf submodule
* Gui: thread safe frame buffer callback setter.
* RPC: Keep gui record open

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

assets/compiled/screen.pb.h

@@ -0,0 +1,75 @@
+/* Automatically generated nanopb header */
+/* Generated by nanopb-0.4.5 */
+
+#ifndef PB_PB_SCREEN_SCREEN_PB_H_INCLUDED
+#define PB_PB_SCREEN_SCREEN_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_Screen_StartStreamRequest { 
+    char dummy_field;
+} PB_Screen_StartStreamRequest;
+
+typedef struct _PB_Screen_StopStreamRequest { 
+    char dummy_field;
+} PB_Screen_StopStreamRequest;
+
+typedef struct _PB_Screen_StreamFrame { 
+    pb_bytes_array_t *data; 
+} PB_Screen_StreamFrame;
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Initializer values for message structs */
+#define PB_Screen_StartStreamRequest_init_default {0}
+#define PB_Screen_StopStreamRequest_init_default {0}
+#define PB_Screen_StreamFrame_init_default       {NULL}
+#define PB_Screen_StartStreamRequest_init_zero   {0}
+#define PB_Screen_StopStreamRequest_init_zero    {0}
+#define PB_Screen_StreamFrame_init_zero          {NULL}
+
+/* Field tags (for use in manual encoding/decoding) */
+#define PB_Screen_StreamFrame_data_tag           1
+
+/* Struct field encoding specification for nanopb */
+#define PB_Screen_StartStreamRequest_FIELDLIST(X, a) \
+
+#define PB_Screen_StartStreamRequest_CALLBACK NULL
+#define PB_Screen_StartStreamRequest_DEFAULT NULL
+
+#define PB_Screen_StopStreamRequest_FIELDLIST(X, a) \
+
+#define PB_Screen_StopStreamRequest_CALLBACK NULL
+#define PB_Screen_StopStreamRequest_DEFAULT NULL
+
+#define PB_Screen_StreamFrame_FIELDLIST(X, a) \
+X(a, POINTER,  SINGULAR, BYTES,    data,              1)
+#define PB_Screen_StreamFrame_CALLBACK NULL
+#define PB_Screen_StreamFrame_DEFAULT NULL
+
+extern const pb_msgdesc_t PB_Screen_StartStreamRequest_msg;
+extern const pb_msgdesc_t PB_Screen_StopStreamRequest_msg;
+extern const pb_msgdesc_t PB_Screen_StreamFrame_msg;
+
+/* Defines for backwards compatibility with code written before nanopb-0.4.0 */
+#define PB_Screen_StartStreamRequest_fields &PB_Screen_StartStreamRequest_msg
+#define PB_Screen_StopStreamRequest_fields &PB_Screen_StopStreamRequest_msg
+#define PB_Screen_StreamFrame_fields &PB_Screen_StreamFrame_msg
+
+/* Maximum encoded size of messages (where known) */
+/* PB_Screen_StreamFrame_size depends on runtime parameters */
+#define PB_Screen_StartStreamRequest_size        0
+#define PB_Screen_StopStreamRequest_size         0
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif