espalarm Code

Network module :
- rename (wrongly named) nat field to indicate whether an environment is set up for acme
- remove dead code
Secure module : remove stuff based on hardcoded certificates.
Secrets sample file : changes long overdue, and the renaming stuff above.
Keypad : log level tweaks

bugfixes

Add simplistic restart action

Reduce code size by joining the two functionalities

Extend OTA with browser upload function (MIME structure)

Simplify handling of connected status in Network module

OTA module now consistently updates in 17..18 seconds
Created a small App class to reduce global variable count

Rename Keypad.h to App.h

Start two webservers (http and https)

Remove unused definitions