6.4.0.3 20181222
* Change Hass discovery to short MQTT messages as used by Hass 0.81 and up (#4711)
* Change FallbackTopic detection (#4706)
* Add define WIFI_SOFT_AP_CHANNEL in my_user_config.h to set Soft Access Point Channel number between 1 and 13 as used by Wifi Manager web GUI (#4673)
* Fix Alexa "this value is outside the range of the device". Needs power cycle and Alexa deletion/discovery cycle. (#3159, #4712)
The current 5-second delay before refreshing web ui after settings were changed is not always sufficient as wifi can take up to 10 seconds to re-connect and be available on some wireless networks, depending on the device's RSSI.
This change increases the delay from 5 seconds to 10 seconds which have been tested down to RSSI levels of 25 to be sufficient.
This change also increases the refresh delay when a local OTA is uploaded to 20 seconds which allows enough time for the cp: process to complete and the device to reconnected to wifi under >= 25 RSSI conditions.
* Change command WebSend Host header field from IP address to hostname (#4331)
* Add to command WebSend option to send a direct path when command starts with a slash (#4329)
* Change command WebSend Host header field from IP address to hostname (#4331)
* Add to command WebSend option to send a direct path when command starts with a slash (#4329)
6.2.1.15 20181012
* Fix Color Temperature slider functionality regression from 20180726 (#4037)
* Add auto reload of main web page to some web restarts