Tactility modules refactored (#13)

* refactor modules

* moved esp_lvgl_port to libs/

* added missing file

* fix for sim build

* various sim/pc fixes

* lvgl improvements

* added missing cmake files

libs/lvgl/demos/stress/README.md

@@ -0,0 +1,13 @@
+# Stress demo
+
+## Overview
+
+A stress test for LVGL.
+It contains a lot of object creation, deletion, animations, styles usage, and so on. It can be used if there is any memory corruption during heavy usage or any memory leaks.
+
+![Stress demo with LVGL embedded GUI library](screenshot1.gif)
+
+## Run the demo
+- In `lv_conf.h` or equivalent places set `LV_USE_DEMO_STRESS 1`
+- In `lv_conf.h` enable all the widgets (`LV_USE_BTN 1`) and the animations (`LV_USE_ANIMATION 1`)
+- After `lv_init()` and initializing the drivers call `lv_demo_stress()`