Mod Loading Screen

Ok, this is actually a pretty big update.

• Create a Java agent for even earlier loading. See the mod description for more info
• Support custom icons. See config.txt for more info
• Support Fabric 0.14.23
• [API] Add support for fully custom progress bars
• [API] Prefix entrypoint progress names with entrypoint:
• [Bugfix] Fix progress bars not going away when they finish

• Enable IPC by default on non-macOS platforms, fixing issues on X11
• Add a window icon
• Add a memory usage display
• Add a simple API

• Fix crash with certain mods (including QSL)
• Mac support
• Custom background image by making a config/mod-loading-screen/background.png file (will be resized to 960x540)

• Remove unintentional dependencies on com.mojang.logging and slf4j
• Embed banners instead of downloading them
• Center the window by default