reorganized Panel need a abstract panel base class to make polymorph possible.
Call by ref would be nice?
Changed checkType in expressions
rendering update
After major refactoring a version that does something.
Need IF expression to get working.

Second refactor wil be the to create consistent names throughout the project.
Big refactor fase 2
Type refactor and form cleanup
Merge branch 'master' of https://github.com/software-engineering-amsterdam/sea-of-ql
Panel code om UI packages
syntx + load
Syntax update
add ifNode, blockNode, assignmentNode and variableScope into the tree walker.
test ifNode
introduced swing helper
Added JFrame generation and MigLayout
restart
Enhanced AST with separation of question declarations: computed and var.
Do a correct bugfix of typechecking.
Change events are now properly fired
Allowed escaping of keywords in QLS
Parentheses notes.