daps info command

[ghost]

In some cases (generating overview web pages for documentation servers...), it would be helpful to be able to determine book names, language etc. I would therefore like to see a command daps info that presents me with something like:

Title: My Little Book
Authors: Pinkie Pie, Hasbro
Product Name: Pony OS
Product Version: 2017
Language: en-US
Type: book

In addition to the human-readable format above, this command could also produce an XML version of the same output with a --xml parameter.

Since generating this information probably would not be much extra effort after profiling is done, this information could even be written as a file into the build directory on every build.

[fsundermeyer]

Implemented with e36dd31