Now with added webserver commands and OTA software updates

This is a beta as there are a number of changes that need thorough testing. The webserver is tested only with firefox so there could be issues with other browsers.
OTA support enables uploading a new .bin image without the need for a serial connection.
Basic logging is included which makes a log of up to 40 recent events available on the web interface. These events are currently limited to recent commands and status responses plus a few error reports.
SNTP support has been added which when enabled is used to timestamp the logs and can be used to set trv clocks.
Commands can be issued to discovered EQ3 valves using the web interface. This is only via POST but I will attempt to add a RESTful API in future.