Version 1.5

1. Add 3 options to build subcommand:
   1. --rawModelOutputFolder: to specify the output folder for raw model if --exportRawModel. If the value is not set, raw model will be in the same folder as the output documenation.
   2. --viewModelOutputFolder: to specify the output folder for view model if --exportViewModel. If the value is not set, view model will be in the same folder as the output documenation.
   3. --dryRun: if this option is set, docfx will go through all the build processes for all the documents, however, no documentation will generated.
2. Improve markdown:
   1. Allow paired parentheses in link target, e.g. [text](paired(parentheses(are)supported)now "title").
3. Improve performance for document build.
4. Breaking changes:
   1. modify interface @Microsoft.DocAsCode.Plugins.IDocumentBuildStep.