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Start of the 0.16.x minor series.
This release decouples much of the hardcoded T1w behavior in favor of T1w/T2w options,
to allow easier integration with tools less reliant on a single anatomical scan.
* ENH: Use genericised "anat" input/output for TemplateDimensions (443)
* ENH: Remove much of the hardcoded `T1w` fields in favor of `anat` (433)
* RF: Load package data with acres (448)
* RF: `space-fsaverage` to `sphere_reg` output files (446)
* MNT: Unpin libitk 5.3 (ANTs 2.5.3 is built with 5.4) (445)
* MNT: Clean up doc builds, environment, style checks (444)