pidgin/pidgin

d7e28f8a0994
split up whiteboard.[ch] to separate files

Separate the whiteboard objects to their own files and clean up the code a bit.

Testing Done:
Just compile, docs, and update-pot, the only in tree protocol that supports whiteboards right now is SILC which I can't easily build.

Reviewed at https://reviews.imfreedom.org/r/202/
#define PIDGIN_ICON 104
#define PIDGIN_TRAY_AVAILABLE_4BIT 105
#define PIDGIN_TRAY_AWAY_4BIT 106
#define PIDGIN_TRAY_BUSY_4BIT 107
#define PIDGIN_TRAY_XA_4BIT 108
#define PIDGIN_TRAY_OFFLINE_4BIT 109
#define PIDGIN_TRAY_CONNECTING_4BIT 110
#define PIDGIN_TRAY_PENDING_4BIT 111
#define PIDGIN_TRAY_INVISIBLE_4BIT 112