Launcher update

This concerns the game launcher used to connect to game servers. Updates for game content happens separately.

Changes in Version 0.40.0

• Fixed desktop file. by @Chapien in #296

• Update nix build to 0.39.1 by @Coca162 in #294

• Launcher lag fixes by @metalgearsloth in #300

• Hotfix for X11 + Steam Overlay Crash on Deadkeys in Client by @Ewanderer in #304

Changes in Version 0.39.0

• Update nix build to v0.38.0 by @Coca162 in #287

• Esperanto translations for authentication messages by @deathride58 in #286

• Automaticaly capitalize language name in filters by @kosticia in #238

• Clarify no engine/module for platform errors that the launcher is not responsible by @VasilisThePikachu in #248

• fix(Connector): Add a null ref check for xattr. by @CaasGit in #264

• Remove ReactiveUI #202 but with conflicts fixed. by @CaasGit in #279

• New launcher logo by @Errant-4 in #290