Resolves #161 by switching to the modern ES module shape of the generated package.

Example

Given C# source:

namespace Greeter;

public partial class Api
{
    [Export]  public static string Hello (string name) => $"Hello, {name}!";
    [Import]  public static partial void Log (string message);
}

Before (all bindings under root package):

import { Greeter } from "bootsharp";

Greeter.Api.log = msg => console.log(msg);
const greeting = Greeter.Api.hello("world");

Now (bindings grouped by module):

import { Api } from "bootsharp/greeter";

Api.log = msg => console.log(msg);
const greeting = Api.hello("world");

Breaking changes

• Bindings no longer emitted under the root module, but grouped under ES modules per C# namespace
• Preferences changed:
  • Function renamed to Method
  • Type renamed to Name
  • Added Property and Event
• Bootsharp no longer auto-trims I from interfaces; use the preferences to do this if desired
• MSBuild targets renamed:
  • BootsharpEmit -> BootsharpCS
  • BootsharpPack -> BootsharpJS