Fix/czireader float32 dtype (#423)

* allow the scene index passed in to aicspylibczi to be adjusted based on the true scene indices from the file

* lint fixes

* dims might not contain scene

* extract channel names more safely, and add a comment about a possible better guess from DisplaySetting

* allow 32-bit float pixels support

Author: toloudis

aicsimageio/readers/czi_reader.py

@@ -48,6 +48,7 @@
     "gray8": np.uint8,
     "gray16": np.uint16,
     "gray32": np.uint32,
+    "gray32float": np.float32,
     "bgr24": np.uint8,
     "bgr48": np.uint16,
     "invalid": np.uint8,