New onedrive module + various updates

modules/onedrive.nix

@@ -0,0 +1,21 @@
+{ pkgs, ... }:
+let
+  onedriveCmd = "${pkgs.onedrive}/bin/onedrive --monitor";
+in
+{
+  systemd.user.services."onedrive" = {
+    Unit = {
+      Description = "OneDrive synchronization service";
+      After = [ "network.target" ];
+      PartOf = [ "default.target" ];
+    };
+    Install = {
+      WantedBy = [ "default.target" ];
+    };
+    Service = {
+      ExecStart = onedriveCmd;
+      Restart = "always";
+      RestartSec = "30s";
+    };
+  };
+}