Basic refactoring

Inventory -> Stock
Add dummy MainWindowListener
Refactoring package name
Remove obsolete classes
Remove obsolete classes
Merge remote-tracking branch 'origin/develop' into develop
Make some basic working UI workflow
Refactor package names
Merge branch 'nav-tree-init' into ui-dev
Merge branch 'ui-dev' into develop
Add dummy configuration file NavigationContext
Add bare TaskPane Implementations
Remove obsolete println statement
Add bare StockPane
Use DI to create NavigationPane

Every TaskPanes are declared with @Bean
Merge branch 'nav-tree-init' into ui-dev
Merge branch 'ui-dev' into develop
Merge branch 'develop'
Merge pull request #15 from TheKojuEffect/master

Basic UI workflow