problem:
some layer packages lists have the open and closing parentheses on the same line
as the first and last listed package, but most seem to have them on a separate
lines.
solution:
put the open and close parentheses on separate lines, except for lists with only
a single package, they are written on the same line as the variable name and
parentheses.
fix the lists indentation
This change updates the `packages.el` file to support automatically enabling
flycheck when opening a protobuf file. This is accomplished by adding `flycheck`
to the list of packages, as well as defining a `post-init-flycheck()` function.
I've tested that this works with spacemacs `0.200.7@25.1.1`.
