Main page corrections (Focus, usertoolbar, iconsizes)

[PaulSode]

• Added multiple icon sizes in settings to help with selection by focus
• Added tooltips on main page (usertoolbar, keyboard edition bar)
• Corrected a problem where focus was not cancelling when changing page / selecting a tile
• Corrected a problem where focus on invisible tiles was possible
• Selection by focus is no longer possible in edition mod
• Refactored usertoolbar to accomodate with changes
• Added new icons to usertoolbar to harmonize design
• Added button on usertoolbar to toggle selection by focus without having to go through settings