Bump Mermaid version to 10.0.0

[shtratos]

Mermaid version 10.0.0 is the latest, but it has some breaking API changes.

I had to change the mermaid.render call as it no longer accepts a callback. see https://github.com/mermaid-js/mermaid/blob/master/CHANGELOG.md#1000

N.B. I tested the rendering and it works for correct graph, but it does not render parsing errors. I'm very new to node.js, so not sure if my changes are correct. Any pointers on how to fix this would be appreciated.

Also:

• I've bumped the version of css-loader to resolve the major version conflict with webpack.
• I've added npm-run-all as a dev dependency to make vscode:prepublish task run on Windows correctly. (Powershell does not recognize ; as a command delimiter )

[shtratos]

I've been seeing this issue in the logs, let's see if the fix helps https://github.com/mermaid-js/mermaid/issues/4140

[shtratos]

Closing in favour of #184