add lv_components as src/extra and minor fixes

examples/layouts/flex/lv_flex_example_5.c

@@ -0,0 +1,28 @@
+//#include "../../lv_examples.h"
+//
+///**
+// * Demonstrate the effect of margin on flex item
+// */
+//void lv_ex_flex_5(void)
+//{
+//    lv_obj_t * cont = lv_obj_create(lv_scr_act(), NULL);
+//    lv_obj_set_size(cont, 300, 220);
+//    lv_obj_align(cont, NULL, LV_ALIGN_CENTER, 0, 0);
+//    lv_obj_set_flex_dir(cont, LV_FLEX_DIR_ROW_WRAP);
+//
+//    uint32_t i;
+//    for(i = 0; i < 20; i++) {
+//        lv_obj_t * obj = lv_obj_create(cont, NULL);
+//        lv_obj_set_size(obj, 100, LV_SIZE_AUTO);
+//        lv_obj_set_flex_item(obj, true);
+//
+//        /*Set margin on every side*/
+//        if(i == 4) {
+//            lv_obj_set_style_local_margin_all(obj, LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, 20);
+//        }
+//
+//        lv_obj_t * label = lv_label_create(obj, NULL);
+//        lv_label_set_text_fmt(label, "Item:%d", i);
+//    }
+//}
+//