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_6.py

@@ -0,0 +1,43 @@
+from imagetools import get_png_info, open_png
+# Register PNG image decoder
+decoder = lv.img.decoder_create()
+decoder.info_cb = get_png_info
+decoder.open_cb = open_png
+
+# Create an image from the png file
+try:
+    with open('../assets/img_cogwheel_argb.png', 'rb') as f:
+        png_data = f.read()
+except:
+    print("Could not find img_cogwheel_argb.png")
+    sys.exit()
+
+img_cogwheel_argb = lv.img_dsc_t({
+  'data_size': len(png_data),
+  'data': png_data
+})
+
+#
+# Using the Image style properties
+#
+style = lv.style_t()
+style.init()
+
+# Set a background color and a radius
+style.set_radius(5)
+style.set_bg_opa(lv.OPA.COVER)
+style.set_bg_color(lv.palette_lighten(lv.PALETTE.GREY, 3))
+style.set_border_width(2)
+style.set_border_color(lv.palette_main(lv.PALETTE.BLUE))
+
+style.set_img_recolor(lv.palette_main(lv.PALETTE.BLUE))
+style.set_img_recolor_opa(lv.OPA._50)
+# style.set_transform_angle(300)
+
+# Create an object with the new style
+obj = lv.img(lv.scr_act())
+obj.add_style(style, 0)
+
+obj.set_src(img_cogwheel_argb)
+
+obj.center()