activex: remove logo when control runs in usermode and fill canvas with background color instead, which is settable as "BackColor" property (or bgcolor for web).

- libvlc APIs: bug fixing, and please note that exception argument is OPTIONAL (can be null), do not use exception to control API flow unless you created your own

    Clean some code, comment it and cosmetics.
    Fix also a cosmetic button bug spotted by funman.

Patch by Mirsal ENNAIME, as usual.

Qt4 - Move the Write MetaData button outside of the component part because it is more expected to be in the main dialog.

Adds some debug message and extra check

Libvlc: Implement media_instance_[get|set]_media_descriptor. Now, media_instance_new creates an empty object. The old _new is now _new_from_media_descriptor.

Adds a button into qt4 media information to write modified meta data to the file

Modify meta writer callback to take an input_item_t as argument, so a file non playing can be written

Added new hotkeys "key-menu-[on|off|left|right|up|down|select]". Lirc now calls the osd_Menu*() functions directly when prefix "menu " followed by one of: on, off, left, right, up, down or select is found.