Add `A`, `I`, `$`, `0` bindings to iedit state
Better name for the function camdez/show-buffer-filename
Restore the warning level before packages initialization

The *Warning* buffer will now popup correctly if there is an
error during packages initialization
Disable leader in iedit-insert state
Fix `A` and `I` descriptions in iedit layer documentation
Fix `C-U` bindings in iedit state
Fix `overlayp, nil` in iedit state
Fix `o` and `O` in iedit states
Add `tab` to toggle current occurrence in iedit state
Fix guide-key breakage

1958678754 (0.26.0) introduced a customisable variable
`dotspacemacs-leader-key`. Hardcoded instances of the leader were
replaced by references to this variable. An error in this refactoring
has broken guide-key.

This change fixes a bug where the variable name was added to a quoted
list, inserting the symbol and not the variable's value.

After this change, guide-key should display again.
Add a variable to enable or disable EDTS in erlang-elixir layer