Early bail instead of nested "if" makes it a bit easier#9

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ApanLoon wants to merge 3 commits intoXRobots:masterfrom

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Commits on Sep 5, 2018

Early bail instead of nested "if" makes it a bit easier to trace program flow, I think.
fre-ber
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Use #define instead of "magic numbers" for LED and switch pins. Easier to understand the code as well as easier to modify for the other set of legs in Slave02.
fre-ber
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Broke out the function to locate an end stop. This is a big one and I might have messed several things up here. Be careful to validate that the actual axis and pins are as they should. Also conside…
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