requires c-toxcore from request 560202

- Update to version 1.13.0:
* refactor: Update AboutFriend with new interface
* refactor: Add using IFriendSettings in AboutFriend model
* refactor: Add IFriendSettings
* fix(build): Add missing dependency for openSUSE
* refactor: Use signal + slot to update view
* refactor: Improve interface
* fix(travis): switch back to older Ubuntu Image
* fix(video): improve debug message
* fix(video): choose first available resolution in preview automatically
* fix(video): use float framerates also for V4L2
* fix(video): allow not integer framerates
* fix: elimination of warning '-Wreorder'
* fix(cmake): fix platform extensions for windows
* fix(chatwidget): fix send file button not working
* fix(video): Fix square form of a video
* fix(cpu): Reduce CPU usage by avatar render
* fix(install): Fix gzip invalid usage
* fix(cmake): add missing dependency
* feat(avatar): Add outline hightlight on mouse hover
* refactor: Make MaskablePixmapWidget allow to apply style
* fix: Use epsilon to compare float
* refactor: Remove code duplication from GroupWidget
* refactor: Add pure virtual methods for main actions in chat
* refactor: Move buttons style in ChatForm css
* refactor(style): Move chatFormHeader to chatForm
* refactor: Restruct code
* refactor(chatform): Remove Nexus and Profile dependency from ChatForm
* chore(build): Qt's website already does mirror load balancing
* chore(build): bump Qt version to 5.9.3 for Windows