updated waveshare code

v20
supports 2in13 v3, 2in13b v4, 3in52, 2in7 v2

support display 7in5 v2

v19

updated waveshare code (support vor 7in5 v2)

support current ESP8266 boardpackage v3.0.0

• MQTT credentials
• 7.5" display does not sleep
• do not check for updates after deep-sleep
• support ESP8266 boardpackage v3.0.0

updated waveshare code

v17

updated waveshare code, cosmetical changes

fixed don't unsubscribe to avoid missing update

v16

don't unsubscribe to avoid missing update

fixed internal LED is not compatible with display

v15

getting packets failed

changed MQTT subscription

v14

provide changelog

support multiple MQTT clients

v13

fixed string initialisation

go to sleep immediately if no update is available

v11

go to sleep immediately if no update is available

flash builtin LED if webserver is available

v10

flash builtin LED