(gdb-get-buffer, gdb-get-buffer-create, gdb-init-1)

(gdb-get-buffer, gdb-get-buffer-create, gdb-init-1)
(gdb-bind-function-to-buffer, gdb-add-subscriber)
(gdb-get-subscribers, gdb-emit-signal, gdb-buf-publisher)
(gdb-update): We now store all GDB buffers in a list so that they
can be updated by traversing a list instead of calling invalidate
triggers explicitly
(def-gdb-trigger-and-handler): New macro to define trigger-handler
pair for GDB buffer.
(gdb-stack-buffer-name): Add thread information.