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If the user uses old QtC settings files (QtCreator.ini), sidebar item
names are there translated. Because the new settings uses id's instead
of translated names, old sidebar items will not exist on save, causing
crashes. this fixes that issue.

Reviewed-by: con

For usage with 709cb294.

Prompt to set up the public symbol server unless
it is already configured or the environment
variable exists. Change the dialog to be
based on the PathChooser to be able to suggest
a non-existent directory.
Acked-by: Alessandro Portale <alessandro.portale@nokia.com>

Parsing of definitions metadata for mime type registering is now in a separate thread (QtConcurrent). Also some clean up.

Indenter is now a separate class which can be reused through composition. Added it to the generic editor.

Fix in Utils::unCommentSelection to consider initial whites spaces when there's no selection and single line comment style.

Changed < for <= in Utils::unCommentSelection to catch cases where there are no characters (only a line end, for example) after the comment start mark.

Ex.:
/*
void f();*/

Generalized Utils::unCommentSelection; Started implementing editor details (configuration by highlight definition, actions).