Extract more metadata using exifTool

[demoulinv]

Description

This PR adds a pure python node dedicated to extract metadata from image files using exifTool. This node can be connected to the cameraInit node and for all images referenced in the "cameraInit.sfm" file, if exifTool is available, a file containing all metadata is generated. The file format can be selected amongst "txt", "xmp", "xml". Be aware that the "xmp" format cannot store all metadata contained in the image file.

Features list

Implementation remarks

The invocated exifTool command depends on the requested file format in the following way:

• "txt": exiftool [args] imageFile > metadataFile.txt
• "xml": exiftool -X [args] imageFile > metadataFile.xml
• "xmp": exiftool -tagsfromfile imageFile [args] metadataFile.xmp

Optional arguments 'args' can be defined through a string parameter of the meshroom node.
The boolean parameter "keepfilename" allows to keep the image file name for the metadata file but changing the file extension.

[codecov]

Codecov Report

Attention: Patch coverage is 8.33333% with 55 lines in your changes missing coverage. Please review.

Project coverage is 69.44%. Comparing base (3e8b736) to head (baa2e22).
Report is 33 commits behind head on develop.

Files with missing lines	Patch %	Lines
meshroom/nodes/aliceVision/ExtractMetadata.py	8.33%	55 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2645      +/-   ##
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- Coverage    69.93%   69.44%   -0.50%     
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  Files          121      122       +1     
  Lines         7088     7144      +56     
===========================================
+ Hits          4957     4961       +4     
- Misses        2131     2183      +52     

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[servantftechnicolor]

• I got non explicit errors if nothing is connected to the node
• Nothing appears in the log if exiftool is not found
• On Error, the node does not fail.