Builder syntax to the converter

[rnielikki]

Currently the pattern is simply like this:

(new Converter()).ConvertAsync()

The plan is editing the syntax into:

(new Converter()).AddConfig("appsettings.json").AddFiles().AddStaticPages().BuildAsync()

• Currently adding (copying) files and static page feature does not exist - will be added
• Converting content is always as default, so doesn't need to be added
• Better if Initialize() or CleanAsync() works in this way too.

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Second plan is changing tags / recent pages like this.

(new Converter()).AddConfig("appsettings.json").AddContentServices(/* ContentManager like TagManager or RecentPageManager */).AddContentServices(/* IEnumerable<ContentManager> */).BuildAsync()

The settings file will be affected and more complicated to edit, as well as the priority of this feature is low (this can be started when the first feature is done, at least).

[rnielikki]

Opened branch for this.

[rnielikki]

This will be postponed until the editor is changed - because it can cause API usage change. But maybe 2.0