Detector2D now parameterized through width and center in phi,alpha (#854)

Some code duplication in the GUI (Axis -> Span property and form), to be revised later.

Resolves #854 (closed).

requested review from @m.svechnikov

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• fcdd6190 - for backward compatibility

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aborted the automatic merge because source branch was updated

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• 85542d5b - clang-format

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merged

mentioned in commit 5056f61d