Merge branch 'v5'

Update build number during build

+semver: skip

Fix bugs related to new UTF8 properties

#47

Update changelog

+semver: skip

Update changelog

+semver: skip

Update changelog for 3.0.1

Add release date for v3.0.0 to changelog

Add casting operators for int? and long? (#35)

+semver: feature

Use cake for all build related and fix code coverage

Add icon