[FL-3579, FL-3601, FL-3714] JavaScript runner (#3286)

* FBT: cdefines to env, libs order
* API: strtod, modf, itoa, calloc
* Apps: elk js
* Apps: mjs
* JS: scripts as assets
* mjs: composite resolver
* mjs: stack trace
* ELK JS example removed
* MJS thread, MJS lib modified to support script interruption
* JS console UI
* Module system, BadUSB bindings rework
* JS notifications, simple dialog, BadUSB demo
* Custom dialogs, dialog demo
* MJS as system library, some dirty hacks to make it compile
* Plugin-based js modules
* js_uart(BadUART) module
* js_uart: support for byte array arguments
* Script icon and various fixes
* File browser: multiple extensions filter, running js scripts from app loader
* Running js scripts from archive browser
* JS Runner as system app
* Example scripts moved to /ext/apps/Scripts
* JS bytecode listing generation
* MJS builtin printf cleanup
* JS examples cleanup
* mbedtls version fix
* Unused lib cleanup
* Making PVS happy & TODOs cleanup
* TODOs cleanup #2
* MJS: initial typed arrays support
* JS: fix mem leak in uart destructor

Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

lib/mjs/mjs_array_public.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2017 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === Arrays
+ */
+
+#ifndef MJS_ARRAY_PUBLIC_H_
+#define MJS_ARRAY_PUBLIC_H_
+
+#include "mjs_core_public.h"
+
+#if defined(__cplusplus)
+extern "C" {
+#endif /* __cplusplus */
+
+/* Make an empty array object */
+mjs_val_t mjs_mk_array(struct mjs* mjs);
+
+/* Returns length on an array. If `arr` is not an array, 0 is returned. */
+unsigned long mjs_array_length(struct mjs* mjs, mjs_val_t arr);
+
+/* Insert value `v` in array `arr` at the end of the array. */
+mjs_err_t mjs_array_push(struct mjs* mjs, mjs_val_t arr, mjs_val_t v);
+
+/*
+ * Return array member at index `index`. If `index` is out of bounds, undefined
+ * is returned.
+ */
+mjs_val_t mjs_array_get(struct mjs*, mjs_val_t arr, unsigned long index);
+
+/* Insert value `v` into `arr` at index `index`. */
+mjs_err_t mjs_array_set(struct mjs* mjs, mjs_val_t arr, unsigned long index, mjs_val_t v);
+
+/* Returns true if the given value is an array */
+int mjs_is_array(mjs_val_t v);
+
+/* Delete value in array `arr` at index `index`, if it exists. */
+void mjs_array_del(struct mjs* mjs, mjs_val_t arr, unsigned long index);
+
+#if defined(__cplusplus)
+}
+#endif /* __cplusplus */
+
+#endif /* MJS_ARRAY_PUBLIC_H_ */