Convert maven project to Spring Boot

[AlexFalappa]

A new context menu entry for maven projects or a new code generator could make a generic maven project a Spring Boot project by replacing the pom.xml file.

The new content can be obtained from invocation of https://start.spring.io/pom.xml?type=maven-build Initializr web service endpoint.

A dialog should be shown allowing to choose at least:

• project groupId
• project artifactId
• project version
• Java version
• Spring Boot version
• Spring Boot Dependencies

Other details (e.g. project name and description) could be left to direct editing of the pom.xml.

[AlexFalappa]

The existing code generator that tries to add the Spring Boot "facet" to an existing pom.xml should be retired in favour of this approach as too brittle.