This reverts commit 29c78ce841 and all other fixes
that have been made afterwards.
The motivation is that use-package is seen by many as a replacement for
`require`. Is use-package always defer the loading of packages then is breaks
this use case, this does not respect POLA so even if it was making Spacemacs
loading faster (up to 3s faster on some startup on my machine) we just cannot
use it, it would be irresponsible. Spacemacs should be easy to use, loading
performance will come with time but it is not a priority.
- move evil-org to org layer
- move org-plus-contrib to spacemacs-org layer
- remove toc-org from the list of package for org layer
- give ownership of the org package to org layer
- invent a package named default-org in spacemacs-org layer in order
to let the ownership of org package to org layer
- remove unnecessary :mode keyword in use-package from for org
