Also add the tests folder to the `make dist` target.

Fix #1883623 where the canvas size could shrink in one dimension when…

… pasting.

Pull in updated translations.

Update the copyright year.

Pinta 1.4

Pinta 1.3

Pinta 1.2

Pinta 1.1

Pinta assemblies are not Copyright Microsoft.

Bump version numbers to 0.8.