Cascades UI samples 10.2.

On a high level the following changes where made
Added new sample app AppShot for making programatic screen shots
Delegate in TabbedPane sample weatherguesser (10.2 feature)
CustomListItem in sample tl;dr (10.2 feature)
Custom TitleBar in sample tl;dr (10.1 feature)
Updated UX for ActiviyIndicator samples cascadescookbookqml, cascadescookbookcpp, tldr, weatherguesser.
In addition to this we added localization support to a number of samples

Added
appshot

Updated
bucketlist
cascadescookbookcpp
cascadescookbookqml
cowbell
hellocascades
helloforeignwindow
kakel
lightningcrossfadecpp
lightningcrossfadeqml
poemmaker
pullmybeard
quotes
speedwriter
stampcollector
starshipsettings
tldr
weatherguesser