On Windows the default file format is DOS i.e. newlines are \r\n
instead of \n.

When converting a msgpack object to a String object, strings (and byte
arrays) with length 0 are handled as errors. This is fixed by
always using the msgpack data pointer as a valid pointer. For a NULL
pointer there is nothing to copy.

Test by @snoe

Fixes #3844

Refactor input.c, normal.c and edit.c to use the K_EVENT special key to trigger
the CURSORHOLD event. In normal and edit mode, K_EVENT is treated as
K_CURSORHOLD, which enables better handling of arbitrary actions in those
states(eg: In normal mode the previous operator counts will be restored).

Also fix a test in vim_spec.lua. The test had a wrong assumption: cmdheight is
only used to determine when the press enter screen will be shown, not to limit
how many lines or control pagination.

Target: make all tests run with chmod -x ~/.config/nvim ~/.local/share/nvim.

This adds a redraw notification "update_menu" which is sent whenever
Vim's menus are changed by the :menu command and friends.

Remove static modifier from func_call
Move MAX_FUNC_ARGS definnition from eval.c to eval.h