[FL-3925, FL-3942, FL-3944] JS features & bugfixes (SDK 0.2) (#4075)

* feat: JS GPIO PWM, JS GUI Widget view; fix: JS EvtLoop stop on request, JS EvtLoop stop on error
* fix: f18 build
* docs: widget
* fix: js unit test
* change feature naming

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

applications/system/js_app/js_modules.h

@@ -11,7 +11,7 @@
 
 #define JS_SDK_VENDOR "flipperdevices"
 #define JS_SDK_MAJOR  0
-#define JS_SDK_MINOR  1
+#define JS_SDK_MINOR  2
 
 /**
  * @brief Returns the foreign pointer in `obj["_"]`
@@ -254,6 +254,18 @@ static inline void
         return;                                           \
     } while(0)
 
+/**
+ * @brief Prepends an error, sets the JS return value to `undefined` and returns
+ * a value C function
+ * @warning This macro executes `return;` by design
+ */
+#define JS_ERROR_AND_RETURN_VAL(mjs, error_code, ret_val, ...) \
+    do {                                                       \
+        mjs_prepend_errorf(mjs, error_code, __VA_ARGS__);      \
+        mjs_return(mjs, MJS_UNDEFINED);                        \
+        return ret_val;                                        \
+    } while(0)
+
 typedef struct JsModules JsModules;
 
 typedef void* (*JsModuleConstructor)(struct mjs* mjs, mjs_val_t* object, JsModules* modules);