master
docs: Add the YAML Reference manual
rename ExternalProgram object to Program
Docs: standardize between list and array as array
Documentation: remove duplicated text
interpreter: Add a default() function
docs: correct dep.as_system() default value
Revert "Clarify mutable objects usage"
docs: fix example for feature.require
File: Add full_path() method
docs: tweak `depends` for features added in 1.12.0
docs: fix incorrect return type
fix various spelling issues
docs: Add docs for structured_sources
docs: YAML: Add `arg_flattening: false` where required