plugins/gitgutter: migrate to mkVimPlugin

plugins/by-name/gitgutter/renamed-options.nix

@@ -0,0 +1,70 @@
+lib:
+[
+  "maxSigns"
+  {
+    old = "showMessageOnHunkJumping";
+    new = "show_msg_on_hunk_jumping";
+  }
+  {
+    old = "defaultMaps";
+    new = "map_keys";
+  }
+  {
+    old = "allowClobberSigns";
+    new = "sign_allow_clobber";
+  }
+  "signPriority"
+  {
+    old = "matchBackgrounds";
+    new = "set_sign_backgrounds";
+  }
+  {
+    old = "diffRelativeToWorkingTree";
+    new = "diff_relative_to";
+  }
+  {
+    old = "extraGitArgs";
+    new = "git_args";
+  }
+  {
+    old = "extraDiffArgs";
+    new = "diff_args";
+  }
+  {
+    old = "enableByDefault";
+    new = "enabled";
+  }
+  {
+    old = "signsByDefault";
+    new = "signs";
+  }
+  "highlightLines"
+  {
+    old = "highlightLineNumbers";
+    new = "highlight_linenrs";
+  }
+  {
+    old = "runAsync";
+    new = "async";
+  }
+  "previewWinFloating"
+  "useLocationList"
+  "terminalReportFocus"
+]
+++
+  lib.mapAttrsToList
+    (oldName: newName: {
+      old = [
+        "signs"
+        oldName
+      ];
+      new = "sign_${newName}";
+    })
+    {
+      added = "added";
+      modified = "modified";
+      removed = "removed";
+      removedFirstLine = "removed_first_line";
+      removedAboveAndBelow = "removed_above_and_below";
+      modifiedRemoved = "modified_removed";
+    }