New project template should use project name in order to fill default values

[dvojtise]

a typical simple Melange project uses a naming convention similar to org.company.my_language

it would be convenient if the template page could use this information in order to provide default values for package name org.company, for Melange file name my_language, and for Language name my_language instad of leaving the package entry empty and other values "Hello" and "MyLanguage" ...

This would help quickly creating projects for testing purpose...