Add ext_newgrid and ext_hlstate extensions. These use predefined
highlights and line-segment based updates, for efficiency and
simplicity.. The ext_hlstate extension in addition allows semantic
identification of builtin and syntax highlights.
Reimplement the old char-based updates in the remote UI layer, for
compatibility. For the moment, this is still the default. The bulitin
TUI uses the new line-based protocol.
cmdline uses curwin cursor position when ext_cmdline is active.
Fix PVS warnings:
fileio.c:7293 Medium V547 Expression is always true.
fileio.c:7351 Medium V547 Expression 'event == 100' is always false.
event_name2nr returns event_T, so PVS infers that nothing outside of
that range could possibly be returned.
Problem: Cannot set 'dictionary' to a path.
Solution: Allow for slash and backslash. Add a test (partly by Daisuke
Suzuki, closesvim/vim#1279, closesvim/vim#1284)
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