LIRC improvements

[danielk]

Improves LIRC handling in MythTV.

• Allows user to connect to the local LIRC daemon, even if it is running on say /dev/lircd2 rather than /dev/lircd. This is very useful if you have multiple LIRC daemons running, say one for transmit and nother for recv, you do not need to go through any contortions to make sure the LIRC daemon for recv is always on /dev/lircd
• Allows user to connect to a remote LIRC daemon, using host[:port], ip[:port] instead of the default '/dev/lircd'.

[mrand]

Resync'ed patch with trunk. mythtv/libs/libmythui/lirc.cpp had a major conflicts - it would be advisable to double that everything is correct

[Matthew Wire <devel@…>]

Resynced for trunk 19114. lirc.h was failing.

[Matthew Wire <devel@…>]

Unfortunately this doesn't currently compile for me. I'm getting the following errors and can't work out why: In file included from mythmainwindow.cpp:29: lirc.h:16: erreur: function definition does not declare parameters mythmainwindow.cpp:118: erreur: ISO C++ forbids declaration of ‘LIRC’ with no type

[danielk]

Updated patch

[danielk]

Adds SIGUSR2 handler, inspired by #5929.

[danielk]

(In [19499]) Fixes #5583. Allow LIRC device to be set and allow LIRC to be reset externally. This makes setting up a machine with multiple LIRC devices a simpler affair.

[danielk]

(In [19523]) Refs #5583. Make sure we handle modifier keys correctly for LIRC. Qt4's QKeySequence requires that the modifier name be followed by a '+' instead of the lircrc standard of '-'. also we want to release the modifier keys after releasing the character key, so the key release loop has been inverted.

[danielk]

(In [19547]) Refs #5583. Make LIRC a little less verbose, after first unsuccessful attempt to connect to LIRC downgrade init warnings and errors down to VB_FILE, with the exception of the message saying we're going to stop trying to connect after a large number of retries and the message saying we successfully connected to the daemon.