Improved "Jump to Declaration"
recursion and bool is displayed correctly
Improved thread safety
"view" button disabled when runtime error
deactivate "step out" button when exiting debug mode
Fixed JButton activate bug
Fixed JButton activate bug #2
Improved program close management
Merge pull request #58 from pointhi/master

fix  compiler and interpreter bugs
Merge pull request #59 from fabian1995/master

Bugfixes