added ABP2 pressure sensor support

[stefan23]

need to add to userConfig.h:
#define PRESSURE_VERBOSE 1 // if you want extra debug output
#define PRESSURESENSOR 2 // 0 = no pressure sensor connected, 1 = pressure sensor connected, 2 = ABP2 pressure sensor connected

[LoQue90]

could you add the changes for the userConfig_sample.h in this PR, so the build actions won´t fail? :)
i tryed this yesterday, was working good (onyl checked mqtt output and serial)!

[stefan23]

could you add the changes for the userConfig_sample.h in this PR, so the build actions won´t fail? :) i tryed this yesterday, was working good (onyl checked mqtt output and serial)!

Sure. Sorry for the delay, I was more or less offline during Christmas break. Will the build actions understand it and try to build with #define PRESSURESENSOR 2?
And furthermore, I am still not fully familiar with GitHub and it seems that my subsequent commits after I filed the PR have been included into it. They are not fully completed yet and some code changes need adding the check for PRESSURESENSOR.

[LoQue90]

No they will build with the plain userconfig_sample.
But right now the build actions can't test anything because with those missing pressure macros it can't build.
We should add more example config that will be build and checked.