Roadmap:

1. Documentation is a bit outdated: new commands are missing, some screenshots are
   too old and do not match real command output.

    c) Make better docs on WiFi, add static NAT mapping commands
    d) Update docs on sequences (modulation, eot, head and tail commands)
    f) Add documentation for the "time" command
    g) Review and update "uptime" docs
    h) Review and update screenshots


2.1 Sequences: add sequence capture (using RMT), captured sequence display and 
   saving to a FS. (IR remote capture & playback) add sequence decode, based on
   user-supplied alphabet ("one","zero","head" and "tail")

3. Frequency meter: add support for start/stop pin (i.e. hardware, externally
   controlled start/stop). This can improve accuracy: setting GPIO high/low 
   from an PCNT interrupt handler is much faster than sending TaskNotification.


5.3 Port a single-user, single-threaded simple FTP server - to be able to 
   upload a premade filesystem (i.e. files and directories)
