Solution for waiting (responsive UI)

+ Added splash screen on program start.
+ Added wait screen on executing command and on creating and opening
forms through the ICommandManager binding (CommandInfo.cs).
* IUserInterface was extended.
* Splash screen and wait screen was used from DevExpress
SplashScreenManager.

Issue # 12
rename unit tests
Merge remote-tracking branch 'origin/master' into Morozova_BugFix

Conflicts:
	src/UnitTests/UnitTests.csproj
Merge pull request #714 from olga-jane/Morozova_BugFix

Rename unit tests
Solution for waiting (responsive UI)

Maked correction to names. New names:
AppWaitForm
AppSplashScreen

Issue #395
--
fixed small bug of empty guid in UnitTests - AddExternalFileTest.cs
(cannon build without it)
Merge pull request #713 from qlynn/avtc

Solution for waiting (responsive UI)
isUsed -> jointId in Connector
update About form
Merge remote-tracking branch 'origin/master' into Morozova_UI
implementation diagram PipeAndValidationProvider
Merge branch 'master' of https://github.com/olga-jane/prizm
implementation diagram PipeAndValidationProvider
Merge remote-tracking branch 'origin/master' into Morozova_UI
Merge pull request #715 from olga-jane/Morozova_UI

Update About form
Merge pull request #26 from olga-jane/master

update from origin