gadtools.library jump table

Our open gadtools.library: 19 calls with the same LVOs and registers as AmigaOS 3.2's, checked against the NDK 3.2 .fd file.

gadtools.library's jump table, as OpenGadTools builds it: LVO, call, registers. build-amiga.sh (with ../../common/check_fd.py) checks this against the NDK 3.2 gadtools_lib.fd in the stove and stops on any difference; opengadtools_lib.c's lib_vectors[] follows it line for line. The fd keeps -138..-168 private (six slots, before V39's GT_GetGadgetAttrsA at -174); ours answer 0. Core class (OPEN_LIBRARIES.md, section 5): the gadget, menu and filter calls are locked (one semaphore over the gadget registry and the filter's copies); GetVisualInfoA, FreeVisualInfo, GT_RefreshWindow, GT_BeginRefresh, GT_EndRefresh, DrawBevelBoxA, GT_GetIMsg and GT_ReplyIMsg are anchored (Intuition, graphics and the window's port).

25 slots, 19 public
LVO	Call	Registers
-30	CreateGadgetA	d0, a0, a1, a2
-36	FreeGadgets	a0
-42	GT_SetGadgetAttrsA	a0, a1, a2, a3
-48	CreateMenusA	a0, a1
-54	FreeMenus	a0
-60	LayoutMenuItemsA	a0, a1, a2
-66	LayoutMenusA	a0, a1, a2
-72	GT_GetIMsg	a0
-78	GT_ReplyIMsg	a1
-84	GT_RefreshWindow	a0, a1
-90	GT_BeginRefresh	a0
-96	GT_EndRefresh	a0, d0
-102	GT_FilterIMsg	a1
-108	GT_PostFilterIMsg	a1
-114	CreateContext	a0
-120	DrawBevelBoxA	a0, d0, d1, d2, d3, a1
-126	GetVisualInfoA	a0, a1
-132	FreeVisualInfo	a0
-138	private	none
-144	private	none
-150	private	none
-156	private	none
-162	private	none
-168	private	none
-174	GT_GetGadgetAttrsA	a0, a1, a2, a3