Parser improvements and fixes, Tests (#23)

* Added unit tests, fixed and improved parser

* Updated translation files

* Updated unit tests to work with credentials

* Updated validation CI config

* Updated changelogs, improved CI/CD processes

GUT.Schedule/GUTSchedule.Test/TestCredential.json

@@ -0,0 +1,4 @@
+{
+	"testEmail": "%EMAIL%",
+	"testPassword": "%PASSWORD%"
+}