Add header selection adapaters
Fix multiplicity command
Add MessageEditWizard
Add messege selection adapter class (not implemented yet)
Parse model children when needed (not earlier)
Add events
Add ShowWizardDialog method
Message edit wizard
Introduce ModelMapper field in Adapter
Extend MessageAdd wizard
Add Messages Edit Policy
Fix Add wizard
Add getter for every tableViewer in pages

* The getter is needed in Add wizard since it needs to acces data in the
* viewer
Remove TODO which was not necessary
Add getPerfCakeComponents method to AbstractCommandTableViewer API
Add function to parse period types from perfcake
Use utils API for PeriodTypes
Add period commands
Add necessary TableViewers
Inehrit PropertyPage from AbstractPerfCakePage