[bug]: Sieve filters - Case sensitivity

[nomadturk]

Which feature or improvement would you like to request?

At the moment, when you want to include a filter, it's case sensitive.
The the UI only creates them with lower case names. So if you want to create "FilterName", it ends up being "filtername"
Meaning, any existing rules that you want to import like:

import :global "FilterName";

Fails due to "FilterName" not found error.
Either the import command should do the search in a case-insensitive way or the UI should allow creation of mixed-case named filters.

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