Ivan Grokhotkov 8c26dd8d38 Merge branch 'feature/idf_version' into 'master'
build system: add IDF_VER environment variable and preprocessor define

This adds an `IDF_VER` preprocessor define which is obtained from `git describe`.

Looks like `v1.0-275-g0efaa4f` for non-release version or `v2.0` for a tagged (release) version.

See merge request !403
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