Added ESP32 support

[4lloyd]

This PR adds support for the ESP32 module and fixes #48. The changes are tested on an ESP32 Dev Module.

The default IR send pin is 26, but this can be changed in "IRLibESP32.h".

[Humancell]

I am curious, is there a reason this PR was not integrated to provide ESP32 support to the project? I'd rather not use a fork, but there are forks that now exist that seem to work. Was there something wrong with the PR?

[nccchirag]

@4lloyd - Is there a working sample which can be used with the PR?

[4lloyd]

@4lloyd - Is there a working sample which can be used with the PR?

@nccchirag When I made the pull request I used the examples from the library itself to test. I can't remember which examples I have used to test, because I made the changes more then 3 years ago.

[nccchirag]

@4lloyd - Is there a working sample which can be used with the PR?

@nccchirag When I made the pull request I used the examples from the library itself to test. I can't remember which examples I have used to test, because I made the changes more then 3 years ago.

No problem, thank you so much for the prompt response. Any chance of modifying/enhancing the PR to support latest libraries?