refactor: eliminate misc2.c

move `call_shell` to misc1.c
Move some fns to state.c
Move some fns to option.c
Move some fns to memline.c
Move `vim_chdir*` fns to file_search.c
Move some fns to new module, bytes.c
Move some fns to fileio.c

src/nvim/api/window.c

@@ -11,7 +11,6 @@
 #include "nvim/window.h"
 #include "nvim/screen.h"
 #include "nvim/move.h"
-#include "nvim/misc2.h"
 
 
 /// Gets the current buffer in a window