build: Merge cli, gui, web, updater into app

.github/dependabot.yml

.github/workflows/github-prerelease.yml

.github/workflows/github_release.yml

.github/workflows/test.yml

.gitignore

.gitlab-ci.yml

.runConfigurations/Build without tests with version.run.xml

.runConfigurations/Build without tests.run.xml

.runConfigurations/Debug Fat Jar.run.xml

.runConfigurations/WebService.run.xml

Dockerfile

build.gradle.kts

serverpackcreator-api/README.md

serverpackcreator-api/src/main/resources/CHANGELOG.md

serverpackcreator-app/README.md

serverpackcreator-app/build.gradle.kts

serverpackcreator-app/module.md

...lin/de/griefed/serverpackcreator/app/ServerPackCreator.kt

.../griefed/serverpackcreator/app/cli/ConfigurationEditor.kt

...n/kotlin/de/griefed/serverpackcreator/app/gui/GuiProps.kt