Rebuild Button click engine

The native engine from ESPHome cannot be used here as a button press event is triggered on touch, which would trigger the click even on swipe.
Other projects solved this by tracking only single click and only at release, so we decided to implement this in a different way, so we can handle multiple or long-clicks also.
This should finally solve #14, but some test is required to ensure nothing else was broken.

ESPHome/TX-Ultimate-Easy-ESPHome_core_hw_touch.yaml

@@ -233,8 +233,8 @@ tx_ultimate_easy:
         ESP_LOGD("tx_ultimate_easy", "  Position: %i", touch.x);
 
 uart:
-  id: uart_touch
-  tx_pin: GPIO19
-  rx_pin: GPIO22
-  baud_rate: 115200
+  - id: uart_touch
+    tx_pin: GPIO19
+    rx_pin: GPIO22
+    baud_rate: 115200
 ...