DEN-1090 : UI Message Handler / Error Handler
- Trying a solution to have separate unit tests for each feature.
- Changed the unittests class to tst_canbus since this is the unit test for implemented canbus messages and interaction.
- removed .pro.user from gitignore since denali.pro.user contains configurations for local unit tests setup and need to be cloned for the new ones.
- Fixed issues which has been found during the unit tests.