(core) move home server into core

Summary: This moves enough server material into core to run a home server.  The data engine is not yet incorporated (though in manual testing it works when ported).

Test Plan: existing tests pass

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2552

app/gen-server/migration/1569946508569-FirstTimeUser.ts

@@ -0,0 +1,18 @@
+import {MigrationInterface, QueryRunner, TableColumn} from "typeorm";
+import {nativeValues} from 'app/gen-server/lib/values';
+
+export class FirstTimeUser1569946508569 implements MigrationInterface {
+
+  public async up(queryRunner: QueryRunner): Promise<any> {
+    await queryRunner.addColumn("users", new TableColumn({
+      name: "is_first_time_user",
+      type: nativeValues.booleanType,
+      default: nativeValues.falseValue,
+    }));
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<any> {
+    await queryRunner.dropColumn("users", "is_first_time_user");
+  }
+
+}