Fix memory leak, from Fadi Afani.

Fixes for memory leaks reported by Lu Ming Yin, fixes from Howard Chu.

Don't strdup NULL filename.

Handle NULL client (in config file) when showing a status message; also
copy the file when processing if-shell since it may be freed. GitHub
issue 3746.

Change a few types to fix warnings, from Thomas Klausner.

Fix command prompt not to always append argument but only if there has
actually been expansion. GitHub issue 3493.

Fix parsing of optional arguments so that and accept a - starting an
argument.

Add send-keys -K to handle keys directly as if typed (so look up in key
table). GitHub issue 3361.

Fix validation of missing percentage arguments.

Expand arguments to some commands where it makes sense, GitHub issue
3204 from Anindya Mukherjee.

Check if args_strtonum argument is NULL or not a string, from Anindya
Mukherjee.

Allow optional arguments.

fatalx on unknown enum members in a couple of places, from Ben Boeckel.

Keep -? as usage.

Expand argument to run-shell again.

Change copying arguments to that flags without arguments are inserted
correctly and empty arguments lists do not crash. Fixes crash reported
by & ok mpi@.

Replace %% in command lists (by copying them) for template arguments ,
this means they can be used with {} as well. Also make argument
processing from an existing vector preserve commands. GitHub iss

Replace %% in command lists (by copying them) for template arguments ,
this means they can be used with {} as well. Also make argument
processing from an existing vector preserve commands. GitHub issue 2858.

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Validate command argument types (string or command list) and give more
useful error messages.

args_make_commands_now needs to take an extra reference to the returned
command list since it will be freed already.

Move command argument parsing common functions and don't bother to parse
again if given a command rather than a string.

Free value properly.

Preserve argument type in command and convert to string on demand.

Pass typed arguments out of the parser into the arguments list and let
it convert them into strings.

Rename a member to match what it will be in future.

Wrap command argument definitions in their own struct.