Implement LVGL with SDL for simulator (#16)

* Implemented LVGL with SDL for simulator

* cleanup

* added SDL to build

* build fix

* mutex fixes

* sim app cleanup and improvements

* docs updated

* fix for sdl?

* fix for SDL cmake setup

libs/lv_drivers/win_drv.h

@@ -0,0 +1,60 @@
+/**
+ * @file fbdev.h
+ *
+ */
+
+#ifndef WINDRV_H
+#define WINDRV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifndef LV_DRV_NO_CONF
+#ifdef LV_CONF_INCLUDE_SIMPLE
+#include "lv_drv_conf.h"
+#else
+#include "../lv_drv_conf.h"
+#endif
+#endif
+
+#if USE_WINDOWS
+
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include "lvgl.h"
+#else
+#include "lvgl/lvgl.h"
+#endif
+
+#include <windows.h>
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+extern bool lv_win_exit_flag;
+extern lv_disp_t *lv_windows_disp;
+
+HWND windrv_init(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif  /*USE_WINDOWS*/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*WIN_DRV_H*/