Updated MvvmCross to 6.4.0#55

Merged

gshackles merged 2 commits intoFluentLayout:masterfrom

fedemkr:bump-mvx-6-4

Sep 24, 2019

Commits on Sep 24, 2019

Updated MvvmCross from 4.4.0 to 6.4.0 and changed QuickLayout.Core target framework to NetStandard 2.0
fedemkr
committed
Cleaned solution comments and files not used
fedemkr
committed