sequence now returns an owning type

[anarthal]

Renamed format_sequence_view to format_sequence format_sequence members are now part of the public API Moved sequence to a separate header Added sequence_range_t

close #359

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.04%. Comparing base (41f07d2) to head (9debf1e). Report is 1 commits behind head on develop.

Additional details and impacted files

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