Eyekit

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- Eyekit 0.3 makes a core change to the way fixation data is stored. Rather than store fixations as `(x, y, duration)`, fixations are now stored as `(x, y, start_time, end_time)`, from which duration can be computed on the fly. The advantage of this is that FixationSequences can now be synchronized with other experimental events or imaging data.

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- Added a new `import_csv()` function
- Simplified the `import_asc()` function

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- New `import_asc()` function which is more resilient to different kinds of input file
- By default, `write()` does not compress the JSON

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- File paths in `io` and `vis` are explicitly converted to string, allowing support for e.g. pathlib paths
- Removed test code from wheel

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- Minor changes to the `cluster`, `merge`, and `regress` correction algorithms

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- Added `discard_short_fixations` tool
- `snap_to_lines` now modifies `FixationSequence` in place, like other tools
- Added `purge` method to `FixationSequence`
- Removed `fixation_sequence_distance` function – no clear use case