Napari-tools-menu

What's Changed
* Delayed imports and dummy objects (thansk to tcompa in https://github.com/haesleinhuepf/napari-tools-menu/pull/10)

**Full Changelog**: https://github.com/haesleinhuepf/napari-tools-menu/compare/0.1.17...0.1.18

Bugfix:
* Hide FutureWarning regarding napari 0.5.0
* Prevent crash on headless systems (thanks to thawn for reporting)

Bugfix
* Voxel size of outputs will be equal to voxel size of the first input image. (Thanks to sebi06 for reporting this issue)

Changes
* Simplified SurfaceData handling
* Added PointsData handling to enable workflows containing PointsData processing steps

New features
* Workflow-support for functions producing surface layers (Thanks to jo-mueller for reporting a related issue)

Bugfix:
* Disabled close button of dock widgets to prevent downstream issues when running workflows with closed widgets