Replace ntfs-3g with ntfsprogs

We don't need the userspace FUSE-based ntfs-3g driver because the kernel
includes one for reading and writing to NTFS. However we do need the
command-line NTFS tools for Partition Manager. So just keep those.

Because ntfs-3g was the last thing depending on fuse2, manually add it
back, because we don't want to break a bunch of old AppImages. Put that
as well as some other app-enablement-related packages to a new group in
Core.

mkosi.conf.d/00-packages-core.conf

@@ -10,7 +10,6 @@ Packages=
     # Base system: bootloader, kernel, firmware, and low-level libraries
     amd-ucode
     edk2-shell # UEFI shell
-    flatpak
     glibc-locales # instead of running locale-gen as part of our build we install a package that has all locales pre-generated
     intel-ucode
     kernel-modules-hook
@@ -94,12 +93,17 @@ Packages=
     f2fs-tools # Manipulating f2fs filesystems; used by kpmcore
     fatresize # Resizing FAT filesystems; used by kpmcore
     mokutil # To manage the Machine Owner Key (MOK) list for Shim (only for advanced users); needs low-level access to work
-    ntfs-3g # access ntfs partitions; used by kpmcore
+    ntfsprogs # Manipulating ntfs filesystems; used by kpmcore
     nvidia-prime # prime-run command; used in kio via Dolphin, Plasma, KRunner
     sbsigntools # To sign and verify EFI binaries; needs low-level access to work
     xfsprogs # Manipulating XFS filesystems; used by kpmcore
     ydotool # Basic TUI and GUI app automation; needs low-level access to work
 
+    # App support
+    flatpak # Flatpak apps
+    fuse2 # Some AppImage apps
+    fuse3 # The rest of the AppImage apps (also loads of other things as a required dependency)
+
     # Virtualization/VM integration
     dnsmasq # Hotspot creation and networking in VMs
     edk2-ovmf # UEFI support for virtual machines