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/examples/styles/lv_example_style_2.py

@@ -0,0 +1,21 @@
+#
+# Using the background style properties
+#
+style = lv.style_t()
+style.init()
+style.set_radius(5)
+
+# Make a gradient
+style.set_bg_opa(lv.OPA.COVER)
+style.set_bg_color(lv.palette_lighten(lv.PALETTE.GREY, 1))
+style.set_bg_grad_color(lv.palette_main(lv.PALETTE.BLUE))
+style.set_bg_grad_dir(lv.GRAD_DIR.VER)
+
+# Shift the gradient to the bottom
+style.set_bg_main_stop(128)
+style.set_bg_grad_stop(192)
+
+# Create an object with the new style
+obj = lv.obj(lv.scr_act())
+obj.add_style(style, 0)
+obj.center()