WIP: Initial menu implementation with rotary encoder

[FabianSperrle]

define menu structure for setting brew temp and steam temp (other entries for times etc. could easily be added)
add rotary encoder library to read encoder state

TODO:

• no support for upright displays yet
• multilanguage support started but not yet finished
• Pins need to be defined in userConfig.h at the moment
• I don't like that all the code is in the "main" file, making it even longer and more cluttered. However, I did not manage to move the display rendering code to displays.h yet as I always faced issues with variables not being defined.

I'm curious to hear your feedback and ideas on how to proceed with this, if you are interested.

[fiendie]

You renamed userConfig_sample.h to unserconfig_sample.h, that's why the build is failing :)

[fiendie]

I finally had time to test it further.
The menu itself works great.

The three issues I noticed during testing:

• displayMenu() uses the font size that is currently displayed on screen so it's too large when the cold start screen is displayed for example
• The ESP crashes when the menu is open and I try to access the website
• I still get the occasional downward spike in temperature

I took the liberty of fixing the first issue and some code style issues along with it :)
If you want to have a look, I pushed it to https://github.com/fiendie/clevercoffee/tree/rotary
Maybe you can cherry-pick the commit and rebase/squash it into your changes so you retain full authorship for the changes. I just added the commit so it's clear what I actually changed.

[FabianSperrle]

Continued in #419