refactor(theme): flatten theme directory structure (#10115)

include/lvgl/lvgl.h

@@ -171,10 +171,10 @@
 #include "stdlib/lv_mem.h"
 #include "stdlib/lv_sprintf.h"
 #include "stdlib/lv_string.h"
-#include "themes/default/lv_theme_default.h"
 #include "themes/lv_theme.h"
-#include "themes/mono/lv_theme_mono.h"
-#include "themes/simple/lv_theme_simple.h"
+#include "themes/lv_theme_default.h"
+#include "themes/lv_theme_mono.h"
+#include "themes/lv_theme_simple.h"
 #include "tick/lv_tick.h"
 #include "widgets/lv_3dtexture.h"
 #include "widgets/lv_animimage.h"

include/lvgl/themes/lv_theme.h

@@ -133,9 +133,9 @@ void lv_theme_set_external_data(lv_theme_t * theme, void * data, void (* free_cb
  *    MACROS
  **********************/
 
-#include "default/lv_theme_default.h"
-#include "mono/lv_theme_mono.h"
-#include "simple/lv_theme_simple.h"
+#include "lv_theme_default.h"
+#include "lv_theme_mono.h"
+#include "lv_theme_simple.h"
 
 #ifdef __cplusplus
 } /*extern "C"*/

include/lvgl/themes/lv_theme_default.h

@@ -13,7 +13,7 @@ extern "C" {
 /*********************
  *      INCLUDES
  *********************/
-#include "../lv_theme.h"
+#include "lv_theme.h"
 
 #if LV_USE_THEME_DEFAULT
 

include/lvgl/themes/lv_theme_mono.h

@@ -13,7 +13,7 @@ extern "C" {
 /*********************
  *      INCLUDES
  *********************/
-#include "../lv_theme.h"
+#include "lv_theme.h"
 
 #if LV_USE_THEME_MONO
 

include/lvgl/themes/lv_theme_simple.h

@@ -13,8 +13,8 @@ extern "C" {
 /*********************
  *      INCLUDES
  *********************/
-#include "../lv_theme.h"
-#include "../../display/lv_display.h"
+#include "lv_theme.h"
+#include "../display/lv_display.h"
 
 #if LV_USE_THEME_SIMPLE