Problem:    The evalfunc.c file is too big.
Solution:   Move undo functions to undo.c.  Move cmdline functions to
            ex_getln.c.  Move some container functions to list.c.

https://github.com/vim/vim/commit/08c308aeb5e7dfa18fa61f261b0bff79517a4883

Co-authored-by: Bram Moolenaar <Bram@vim.org>

These are not needed after #35129 but making uncrustify still play nice
with them was a bit tricky.

Unfortunately `uncrustify --update-config-with-doc` breaks strings
with backslashes. This issue has been reported upstream,
and in the meanwhile auto-update on every single run has been disabled.

It is less error-prone than manually defining header guards. Pretty much
all compilers support it even if it's not part of the C standard.

Because typval_defs.h is enough for most of them.

Problem:    Inconsistent capitalization in error messages.
Solution:   Make capitalization consistent. (Doug Kearns)

https://github.com/vim/vim/commit/cf030578b26460643dca4a40e7f2e3bc19c749aa

Co-authored-by: Bram Moolenaar <Bram@vim.org>