convert lvgl from submodule to a plain old directory

lib/lvgl/examples/widgets/msgbox/index.rst

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+
+Simple Message box
+"""""""""""""""""""
+
+.. lv_example:: widgets/msgbox/lv_example_msgbox_1
+  :language: c
+
+

lib/lvgl/examples/widgets/msgbox/lv_example_msgbox_1.c

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+#include "../../lv_examples.h"
+#if LV_USE_MSGBOX && LV_BUILD_EXAMPLES
+
+static void event_cb(lv_event_t * e)
+{
+    lv_obj_t * obj = lv_event_get_current_target(e);
+    LV_LOG_USER("Button %s clicked", lv_msgbox_get_active_btn_text(obj));
+}
+
+void lv_example_msgbox_1(void)
+{
+    static const char * btns[] = {"Apply", "Close", ""};
+
+    lv_obj_t * mbox1 = lv_msgbox_create(NULL, "Hello", "This is a message box with two buttons.", btns, true);
+    lv_obj_add_event_cb(mbox1, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
+    lv_obj_center(mbox1);
+}
+
+#endif

lib/lvgl/examples/widgets/msgbox/lv_example_msgbox_1.py

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+def event_cb(e):
+    mbox = e.get_current_target()
+    print("Button %s clicked" % mbox.get_active_btn_text())
+
+btns = ["Apply", "Close", ""]
+
+mbox1 = lv.msgbox(lv.scr_act(), "Hello", "This is a message box with two buttons.", btns, True)
+mbox1.add_event_cb(event_cb, lv.EVENT.VALUE_CHANGED, None)
+mbox1.center()
+