Reduce use of the 'any' type in kendo.all.d.ts and use Union types implemented in TypeScript 1.4

Example:
- Before:
  
    interface GridColumnFilterable {
        ...
        ui?: any;
        ...
    }
    
- After:
    
    interface GridColumnFilterable {
        ...
        ui?: string | GridColumnFilterableUIEvent;
        ...
    }