Add component.mk and allow disabling Button class via Kconfig.

[mkfrey]

The first commit of this pull request adds a component.mk file to allow using this project as a component of esp-idf (< 4.0).

The second commit adds a Kconfig file to allow disabling the Button class using the make menuconfig tool of the esp-idf. This is useful to avoid conflicts with other libraries implementing a class with the same name, e.g. the M5Stack library.

[thomasfredericks]

Hum, would it be simpler if the three classes were in separate files?

[mkfrey]

I don't know if this would change much. I think it would be better to put classes with such generic names into a namespace.

[thomasfredericks]

Since I just released Button, I will convert it to use namespaces even though it is not the «Arduino norm». It should not break user code that much... gulp

[thomasfredericks]

Ok, can you check out the new commit? I moved Button to Bounce2 namespace (Button2::Button).

[mkfrey]

Looks good from a first glance, I will test it at the start of next week.

[mkfrey]

Excuse my late response. The library now works fine from my perspective. I will change this merge request to only contain the component.mk file.

What I noticed when reviewing your commit is that Doxygen outputs are part of this repository and the commits. If this is what you want, I don't want to get in your way of making things. But in my opinion this causes a lot of clutter in the repository and commit history and therefore the Doxygen generated docs should not be part of the repository.

[thomasfredericks]

Yes. I understand about the docs. But I like that everything is bundled together. Thank you for your contribution!

[thomasfredericks]

@mkfrey What would you suggest for the docs?

[mkfrey]

The standard way seems to be to use Travis CI to automatically generate and commit documentation into a separate, orphaned branch "gh-pages".