Bugfix: Use importlib.metadata.version instead import from _version #190
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Closes: #177
In this PR I get the napari version using importlib.metadata.version instead of importing from _version.
In older napari versions the variable name was different, resulting in the error shown in #177
This method should be backwards compatible for any napari on python >= 3.8
To be safe for older python also try importlib_metadata but if that doesn't work, then just note the version as older than 0.4.15, the first version to not support python 3.7.