improv: Rearrange inclusion buttons, change icons, for improved UX. Mention selected entry in remove-button

Check Keeping Data in HELP.md

ej-technologies provided ServerPackCreator with an open source license. More on that in milestone 6.

refactor(ApplicationProperties): Move load from constructor to loadProperties to ensure we always have the classpath-configurations available. When using alpha or beta releases, always check for newer version to prevent people getting stuck on old pre-releases.

improv(GUI): Server icon preview.Buttons to reset, revert clientside mods, copy directories and inspect modpackdirectory

feat(Scan selected modpack directory & Java 8/17 paths in script variables): After selecting the modpack-directory, Minecraft version, modloader and modloader version are automatically set, if possible. Display required Java version. Allow defining Java 8 and 17 paths for local testing and automatically update SPC_JAVA_SPC.

improv(GUI status display): Display a scrolling bar during the generation of a server pack to indicate that ServerPackCreator is currently doing something. Thanks to @Kreezxil for the suggestion!

improv(GUI): Live-checks of input-fields in GUI. Allow closing of splash. Improve text colors of light and dark themes. Move Java args configuration from menu bar to Create Server Pack tab. Make Create Server Pack tab scrollable to improve usability for those with smaller screens. More improvements in version 5, milestone 5.

improv(Startup Sequence): Implement priority system in case multiple arguments have been used (see CommandlineParser). When the GUI is used, display a splashscreen whilst SPC is loading (see ServerPackCreatorSplash). CLI menu for an improved user-experience, giving the user more choice when running in commandline (see ServerPackCreator). The Main-class now only initializes ServerPackCreator and runs it with the determined mode.