Enable Elysium Project Selector for Deploy

This replaces the open textfield with the project selector.
It also now allows the user to select projects from his other
credentialed logins -- without having to switch the active user.

Change-Id: I19ba9115d6f63acbf1b58945c3432db251ece27c
Sample browser

Import DevRel samples from github via a Wizard.
Adds actions in file menu and welcome screen.

Flag guarded with "enable.sample.import"

NOTES
Depends on https://android-review.googlesource.com/#/c/108700/
Refactored out of android plugin : https://android-review.googlesource.com/#/c/97360/

Change-Id: Ic075bb23505bda018e108b20d1a33b7261a14920