v0.12.2

Changelog

• 4ff25a0 Flet version bumped to 0.12.2
• 5ad77c5 add ´skip_route_change_event´ to ´page.go_async´ (#2092)
• ad2ad88 add ´__repr__´ (#2091)
• 9b5f55e $FLUTTER_TARGET_PLATFORM for Windows
• 818351b Use correct release dir for Windows client
• 5da66d8 Fix VC runtime copying