Add BlockType.INLINE support #2

[yuri-kiss]

I deleted my head repo a while ago so I am remaking this pr (#217)

Resolves

Nothing is resolved this is just a new feature.

Proposed Changes

Adds BlockType.INLINE support in full (so compiler support)
This takes the second approach of #187 (comment)
And this PR can be used as a replacement for #187 itself.

Reason for Changes

The need for ugly inline patches and hacky thread stuff.

Test Coverage

No tests but I did try with a extension.

(function(Scratch) {
  class InlineBlockTest {
    getInfo() {
      return {
        id: 'InlineBlockTest',
        name: 'Test: Inline Block',
        blocks: [{
          blockType: Scratch.BlockType.INLINE,
          opcode: 'block',
          text: 'inline',
        }]
      }
    }
    async block(_, util) {
      await (Promise.resolve());
      util.startBranch(1, true); // Loop does not actually work like "loop"
      return 'test';
    }
  }
  Scratch.extensions.register(new InlineBlockTest);
})(Scratch);

[FurryR]

Can it be used for lambdas?

[yuri-kiss]

Can it be used for lambdas?

technically yeah