feat(gui): Set LAF for Java Args correctly. If javaArgs is "empty", display textField as "" to not confuse users.

feat: Add methods to reverse the order of a String List or String Array. Allows setting of lists in GUI with newest to oldest versions.

refactor: Reverse lists of modloader versions to display in order of newest to oldest versions. Closes issue #74.

refactor: Only provide translations for messages which actually have a need for translation. Error/debug messages mainly do not need to be translated, as those will be reported in issues, therefore I need to be able to read them.

feat(gui): Open server.properties in users default text editor via Edit->Open server.properties in Editor

feat(gui): Open server-icon.png in users default picture-viewer. From there on, users can open their favourite editing software.

feat(gui): Redesign help window. Users can choose what they need help with from a list, which then displays the help-text for the chosen item.

fix: When writing configfiles, encapsulate every element of String Lists in `"` in order to avoid problems described in issue #71. Fixes and closes issue #71.