c++, contracts: Simplify contracts headers [NFC].

We have contracts-related declarations and macros split between contracts.h
and cp-tree.h, and then contracts.h is included in the latter, which means
that it is included in all c++ front end files.

This patch:
 - moves all the contracts-related material to contracts.h.
 - makes some functions that are only used in contracts.cc static.
 - tries to group the external API for contracts into related topics.
 - includes contracts.h in the front end sources that need it.

gcc/cp/ChangeLog:

	* constexpr.cc: Include contracts.h
	* coroutines.cc: Likewise.
	* cp-gimplify.cc: Likewise.
	* decl.cc: Likewise.
	* decl2.cc: Likewise.
	* mangle.cc: Likewise.
	* module.cc: Likewise.
	* pt.cc: Likewise.
	* search.cc: Likewise.
	* semantics.cc: Likewise.
	* contracts.cc (validate_contract_role, setup_default_contract_role,
	add_contract_role, get_concrete_axiom_semantic,
	get_default_contract_role): Make static.
	* cp-tree.h (make_postcondition_variable, grok_contract,
	finish_contract_condition, find_contract, set_decl_contracts,
	get_contract_semantic, set_contract_semantic): Move to contracts.h.
	* contracts.h (get_contract_role, add_contract_role,
	validate_contract_role, setup_default_contract_role,
	lookup_concrete_semantic, get_default_contract_role): Remove.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

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