Support multiple variants of export file format names in inx files
#### Summary: When trying to save as jpg, the new raster output extension only allows the precise word 'jpeg'. At least, it's case-insensitive, so one can also use JPEG. It would be useful to allow multiple extensions. For the time being, I've worked around the problem by creating a second inx file. #### Steps to reproduce: - open Inkscape - Save as ... - Select 'guess from extension' - type /tmp/file.jpg #### What happened? The file was saved as file.jpg.svg #### What should have happened? The jpg export dialog should pop up. #### Version Info: ``` - Inkscape Version: 1.1-alpha (da7a25772f, 2021-02-09) - Operating System: Linux Mint 20.1 ```
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