Move the functions that directly manipulate the global state singleton

into global_state.{h,cpp}. Move all of the functions into a new
namespace Global_State_Management, though exposing global_state() into
the Botan namespace for compatability.

Also add new functions global_state_exists and
set_global_state_unless_set which may be helpful in certain tricky
initialization scenarios (eg when an application using botan also uses
a library which may or may not itself use botan).

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