NOMM version 0.12.4

• It is now possible to launch NOMM without having Steam installed on your system
• Minor UI fixes on the first time setup screen

List of PRs

• No steam launch by @Allexio in #104
• First setup UI fixes by @Allexio in #105
• Update nomm version & metainfo releases (0.12.4) by @Allexio in #106

Full Changelog: 0.12.3...0.12.4