(refactoring) Move SearchProvider in tools folder
(tools) Move picture downloading feature in a specific class
(refactoring) Many minor fixes

Clean dead code
Unify members name
Delete pointers that were not
(wizards) Fix some wizards parameters
(wizards) Fix appender registration, to avoid warning if user cancel
(rename) Fix renamewizard's preview table headers
(refactoring) Re-organize mainwindow initialization
(about) Update resource file location
(about) Add cpp code to personalize ui