Refactor update manager to call IsUpdateAvailable non asynchronously.

Conflicts:
	src/DynamoCoreUITests/DynamoCoreUITests.csproj
	src/DynamoCoreUITests/UpdateManagerUITests.cs
	src/DynamoElementsTests/DynamoUnitTest.cs
Add additional UI test for update manager for dropped connection.
Rewire product update button to send to downloads page.
Refactor UpdateManagerUITests to use testing flag and Init method.
MAGN-1270.

Conflicts:
	src/DynamoUnits/Units.cs
MAGN-1270. Tests.

Conflicts:
	src/DynamoElementsTests/UnitsOfMeasureTests.cs
MAGN-1274.
MAGN-1273.
More handling of negative units in tests.
Remove methods brought over in file replacements.