Initial solution support
Changed layout of the right panel
Added GenerateSolution method
Added StringUtil helper class
Updated diagram examples with new indentation
Added TabControl for explorer, options and model
Fixed canvas history for solution
Refactored TreeView events code
Added EnablePage CheckBox
Refactored solution tree selection changed code
Removed unused event code
Fixed pan speed
Added create diagram keyboard shortcut
Removed SetIsSelected for canvas
Refactored model constants
Added open and save solution functionality
Added solution examples
Merge pull request #1 from wieslawsoltes/net35-solution

Added Solution functionality