Upgrade html-webpack-plugin to v4

[dlindenkreuz]

What problem does this feature solve?

html-webpack-plugin v4 provides new features, and adding html-webpack-plugin to vue-cli projects will currently result in v3 and v4 being installed simultaneously. This can lead to some conflicts with plugins that modify HTML output (e.g. html-webpack-harddisk-plugin).

What does the proposed API look like?

n/a

[fm96-dev]

There are any news about this?

[haoqunjiang]

Updated in v5.0.0-alpha.0

[huhm]

Updated in v5.0.0-alpha.0

@vue/cli-service@^4.5.13 is still using html-webpack-plugin@^3.2.0, which is outdated