additional analog inputs: A6-A11

[Adminius]

new PR based on latest core the old one: #267

Pin mapping: A6 ~ D8 A7 ~ D9 A8 ~ D0 A9 ~ D1 A10 ~ D3 A11 ~ D4

[Adminius]

@cmaglie , @sandeepmistry any chance to get this merged? This PR is open since 1 year without any comments :/

[CLAassistant]

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