Add checkbox, radio-button, text-field, dialog styling

...in/java/de/tobias/playpad/design/ModernStyleableImpl.java

...n/java/de/tobias/playpad/viewcontroller/LaunchDialog.java

PlayWall/src/main/resources/style/components/button.css

PlayWall/src/main/resources/style/components/checkbox.css

PlayWall/src/main/resources/style/components/dialog.css

PlayWall/src/main/resources/style/components/list.css

PlayWall/src/main/resources/style/components/radiobutton.css

PlayWall/src/main/resources/style/components/scrollbar.css

PlayWall/src/main/resources/style/components/textfield.css

PlayWall/src/main/resources/style/modern.css

...tobias/playpad/design/ModernGlobalDesignHandlerImpl.scala

...bias/playpad/design/modern/ModernGlobalDesignHandler.java