Move most of perseus - util.ts into perseus-core - util.ts

packages/perseus-core/src/index.ts

@@ -17,3 +17,5 @@ export {PerseusError} from "./error/perseus-error";
 export * from "./data-schema";
 
 export {pluck, mapObject} from "./utils/objective_";
+export {default as Util} from "./utils/util";
+export type {GridDimensions, Position} from "./utils/util";