7c91176186
This commit adds auto-configuration and a starter, spring-boot-starter-freemarker, for using FreeMarker view templates in a web application. A new abstraction, TemplateAvailabilityProvider, has been introduced. This decouples ErrorMvcAutoConfiguration from the various view technologies that Spring Boot now supports, allowing it to determine when a custom error template is provided without knowing the details of each view technology. Closes #679