Cleanup: use plural names for Main lists

Convention was not to but after discussion on 918941483f7e we agree its
best to change the convention.

Names now mostly follow RNA.

Some exceptions:

- Use 'nodetrees' instead of 'nodegroups'
  since the struct is called NodeTree.
- Use 'gpencils' instead of 'grease_pencil'
  since 'gpencil' is a common abbreviation in the C code.

Other exceptions:

- Leave 'wm' as it's a list of one.
- Leave 'ipo' as is for versioning.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/blenloader/intern/readblenentry.c b/source/blender/blenloader/intern/readblenentry.c
index 9f9571d250c..7fcacd8f30e 100644
--- a/source/blender/blenloader/intern/readblenentry.c
+++ b/source/blender/blenloader/intern/readblenentry.c
@@ -439,7 +439,7 @@ BlendFileData *BLO_read_from_memfile(
 			}
 			/* In any case, we need to move all lib datablocks themselves - those are 'first level data',
 			 * getting rid of them would imply updating spaces & co to prevent invalid pointers access. */
-			BLI_movelisttolist(&newmain->library, &oldmain->library);
+			BLI_movelisttolist(&newmain->libraries, &oldmain->libraries);
 
 			blo_join_main(&new_mainlist);
 		}