filterbar: Add support to match case and glob patterns for the filter bar

Currently, Dolphin's filter bar defaults to plain text, but it actually has a hidden regex functionality too: it tries to auto-detect and switch to a regular expression if characters like '*', '?', or '[' are present in the search string.
This approach has a couple of issues. First, the regex/wildcard functionality is completely hidden from the user. Second, the auto-detection is flawed because those are perfectly valid characters in Linux filenames. If a user tries to filter for a file literally named [draft].txt, the auto-switching kicks in and causes unexpected behavior.

This MR fixes this by making the filtering modes explicit through a ComboBox at the side of the filter bar, with the options 'Plain Text', 'Glob' and 'Regular Expression'. It also adds a button to toggle the case sensitive matching. A visual feedback for when the user is inputting an invalid expression has also been implemented by turning the bar background red and making appear an error symbol.

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