add options to hide some tools in toolbar

When using the viewer with a small width, the toolbar might be too wide.

Hiding some tools will make it lighter, but in order to still be able to use them if necessary, I would suggest 3 states:

• hidden: the tool is not visible on the bar;
• visible: the tool is not visible on the bar;
• collapsed: the tool is moved in the More dropdown list;

I’m not sure what is the best way to do it. Maybe adding two more options that use tools identifiers in arrays:

const options = {
    // ...
    hide_tools: ['ortho', 'explode', 'axes0', 'pin_view'],
    collapse_tools: ['axes', 'grid', 'transparent', 'black_edge', 'explode', 'help']
}

[bernhard-42]

Given the analysis in https://github.com/roipoussiere/cadquery-vscode/issues/2 I will not further dig into this. 1.5.6 has the requested trimUI functionality, however your extension needs to deal with the asynchronism of DOM handling.

[bernhard-42]

I have added a function to the next release to selectively enable/disable elements in the tollbar:

Disable:

viewer.trimUI(["axes", "axes0", "grid", "ortho", "more"], false)

Enable:

viewer.trimUI(["axes", "axes0", "grid", "ortho", "more"], true)

Now you can easily go down to width of 400px

Since you have to create the viewer component in the web view of VS Code, you should be able to call this function, right?