Add method to generate Mattermost Autocomplete struct #11
Description
We should provide a method to slashparse that uses the slasparse structure to create an autocomple structure of type *model.AutocompleteData from "github.com/mattermost/mattermost-server/v5/model"
mattermost/mattermost-plugin-gitlab#182 provides a fairly complex autocomplete structure to use to test. Probably requires changes to the Yaml structure