* ForgotPassActivity.cs: Added separate screen for ForgotPassword

* RegisterActivity.cs: Added separate screen for Registration

* bg.png: Added rough BG image for startup screens

* ForgotPass.axml: Added layout for ForgotPass screen

* Register.axml: Added Registration screen layout

* Start.axml: Added Start layout for startup screen

* StartActivity.cs: Added StartActivity for startup screen

* MainActivity.cs: Converted MainActivity to main app screen

* Garnish.csproj: Added resources. Changed class and file names

* AndroidManifest.xml: Changed theme to remove titlebar

* Resource.designer.cs: Added/Changed id's for fields

* Main.axml: Converted Main layout to main app screen

* Strings.xml: Added/Changed strings for layouts

* User.cs: Added Guest role for bypassing login. Set default role to
  Customer for new signups and set role to Guest in default
  constructor.

* test.cs: Deleted test activity