Constructor IrSequence(const microseconds_t, size_t length) with view semantic

[bengtmartensson]

Presently, the constructor IrSequence(const microseconds_t, size_t length) have "move-semantics", i.e. the first argument will be deleted by the destructor. This is sometimes not desirable. Possibly it violates the "const"-ness?

This behavior is documented, so not "bug".

A possible fix would be to have a base class with no deletion and a derived class which deletes.