Taskbar: 7 weapon sets and 7 combat-art slots

cUI_Taskbar2's slot arrays move behind the (enlarged) object with room
for 7 each; all instructions addressing them, the relative accesses
between the two arrays, the slot loops and the count clamp are patched
from tables in game/addresses.h (belt loops untouched). Slots 6 / 7
unlock at levels 45 / 65; AssignArtToSlot accepts slots up to 6. Slot
keys call the taskbar's selection directly (honouring COMBINE_SLOTS).

Shared code: re::PatchAll / PatchInstructionByte for patch tables,
game/engine/objects.h for object, RTTI and kernel calls, slot-hook
templates in skillslots.cpp.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/mods/skillbar.h

@@ -0,0 +1,10 @@
+#pragma once
+
+namespace mods::skillbar {
+
+// Select weapon set / combat-art slot `slot` (0-6) on the taskbar, as its key
+// or a click does.
+void SelectSkillSlot(unsigned slot);
+void SelectWeaponSet(unsigned slot);
+
+} // namespace mods::skillbar