(core) move client code to core

Summary:
This moves all client code to core, and makes minimal fix-ups to
get grist and grist-core to compile correctly.  The client works
in core, but I'm leaving clean-up around the build and bundles to
follow-up.

Test Plan: existing tests pass; server-dev bundle looks sane

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2627

app/client/models/ClientColumnGetters.ts

@@ -0,0 +1,28 @@
+import {ColumnGetters} from 'app/common/ColumnGetters';
+import * as gristTypes from 'app/common/gristTypes';
+
+/**
+ *
+ * An implementation of ColumnGetters for the client, drawing
+ * on the observables and models available in that context.
+ *
+ */
+export class ClientColumnGetters implements ColumnGetters {
+
+  constructor(private _tableModel: any) {
+  }
+
+  public getColGetter(colRef: number): ((rowId: number) => any) | null {
+    const colId = this._tableModel.docModel.columns.getRowModel(Math.abs(colRef)).colId();
+    return this._tableModel.tableData.getRowPropFunc(colId);
+  }
+
+  public getManualSortGetter(): ((rowId: number) => any) | null {
+    const manualSortCol = this._tableModel.tableMetaRow.columns().peek().find(
+      (c: any) => c.colId() === gristTypes.MANUALSORT);
+    if (!manualSortCol) {
+      return null;
+    }
+    return this.getColGetter(manualSortCol.getRowId());
+  }
+}