To enable the search feature just type into the layer list.
This change set also contains some more fixes:
* Tab/Backtab now is functional also before the
Display menu has been used the first time
* Arrow keys work from the cell list again
This feature includes:
* Enhancements to tl::GlobPattern
(exact mode, case insensitive)
TODO: UTF8 support
* Enhancements to DecoratedLineEdit
(ESC key handling, Tab key handling)