GDScript access to copyright, license, author and donor information.

Adds following functions to the Engine singleton:
get_author_info - names of Godot authors
get_copyright_info - detailed source copyright get_license_info
get_donor_info - donor names
get_license_info - full text of licenses used, indexed by license names
get_license_text - the text of the Godot Expat license

core/SCsub

@@ -2,6 +2,8 @@
 
 Import('env')
 
+import methods
+
 env.core_sources = []
 
 
@@ -93,6 +95,17 @@ env.add_source_files(env.core_sources, "*.cpp")
 import make_binders
 env.Command(['method_bind.gen.inc', 'method_bind_ext.gen.inc'], 'make_binders.py', make_binders.run)
 
+# Authors
+env.Depends('#core/authors.gen.h', "../AUTHORS.md")
+env.Command('#core/authors.gen.h', "../AUTHORS.md", methods.make_authors_header)
+
+# Donors
+env.Depends('#core/donors.gen.h', "../DONORS.md")
+env.Command('#core/donors.gen.h', "../DONORS.md", methods.make_donors_header)
+
+# License
+env.Depends('#core/license.gen.h', ["../COPYRIGHT.txt", "../LICENSE.txt"])
+env.Command('#core/license.gen.h', ["../COPYRIGHT.txt", "../LICENSE.txt"], methods.make_license_header)
 
 # Chain load SCsubs
 SConscript('os/SCsub')