The constructor now has zero arguments. showDirectories and showFiles
are now set using setter methods.
FileLister::browse is now the sole way to start a scan for files and
directories, replacing the initial path in the constructor and the
setPath method. It allows merging results from multiple directories
as before.
This is all to make explicit how many times the costly task of browsing
a directory is actually carried out.
The empty "" filter was previously matching all the files; since
a few commits it now matches the files without extensions. The
new "*" filter allows again to match all files.
tolower() will trigger an assertion failure in the case where the
string contains UTF-8 codes. This is not a problem as only the
file extension needs to be processed, and that one should contain
only ASCII.
This is useful when the files/directories lists are not cleared; then it is possible to define priorities between the files.
For instance, the skin "Default" will be shown only once, even if the directory "Default" exists both in the system and the user directories.
As the skin and translation loading functions does check both directories, there is no problem in doing that.
If set to "false", the previous list of files/directories won't be cleared when browsing another directory.
It will allow us to have file choosers that list files contained on different directories.
