Add BMP280 support, compiler directive support for oversampling

[melyux]

Description:

The BMP280 is a sister sensor to the BME280. Unlike the BME280, it doesn't measure humidity but is 33% more accurate than it for pressure. Technically, OMG already supports BMP280 with the same BME280 library (added 2018) and it worked with OMG as it is, but this updates the documentation and comments and removes the error message when a BMP280 is recognized instead of a BME280.

I also add compiler directives for temperature/humidity/pressure oversampling settings for the BME280/BMP280. It's a minor change that mirrors the existing temperature correction, and the comments for it will mention the BMP280, so I included this in this PR too. Let me know if that's ok.

Some minor spelling and grammar fixes in the comments.

I don't know how to edit/suggest things to the Compatibility website, but we could add the BMP-280 sensor I'm using to it.

Checklist:

• The pull request is done against the latest development branch
• Only one feature/fix was added per PR and the code change compiles without warnings
• I accept the DCO.

[1technophile]

Thanks for this, I will add the sensor to the compatibility website