LEDs: Expose presence #45
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This makes most sense for const macros, whose absence can now be checked for at build time (but producing a proper error rather than just not compiling for lack of a symbol)
Beware that while macros defined on the compiler level with `-DNAME` have an implicit value of 1, macros defined with `#define NAME` apparently have an implicit value of 0.
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This adds infrastructure to expose the LEDn_IS_PRESENT macro, and exposes the macro itself.