Clean up a few things in Lumina:

1) When finding a file mimetype, try a case-insensitive filter if nothing came out of the case-sensitive search.
2) lumina-fm: when removing a slideshow file, try to automatically go to the next/previous picture instead of index=0;
3) Add a bunch more processEvents() calls to the lumina-fm file operations dialog. This should keep the UI's more responsive and update the visuals more often while running operations on large numbers of files.
4) lumina-fm: Fix another upper->lower case extension issue when checking if a file is supported by Qt's read/write operations.

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