Add a hover preview for extern symbols that includes type information

A new preview type is added for extern symbols that includes the
external library name, if known, the symbol type, and any call type
override that is applied at the hovered callsite.

Previously, hovering an extern symbol would display a hex preview of the
synthetic extern section which was of limited value.

Author: bdash

ui/uitypes.h

@@ -6,7 +6,7 @@
 // there are changes to the API that affect linking, including new functions,
 // new types, modifications to existing functions or types, or new versions
 // of the Qt libraries.
-#define BN_CURRENT_UI_ABI_VERSION 14
+#define BN_CURRENT_UI_ABI_VERSION 15
 
 // Minimum ABI version that is supported for loading of plugins. Plugins that
 // are linked to an ABI version less than this will not be able to load and

ui/util.h

@@ -175,6 +175,8 @@ void BINARYNINJAUIAPI showHexPreview(QWidget* parent, ViewFrame* frame, const QP
 bool BINARYNINJAUIAPI showDisassemblyPreview(QWidget* parent, ViewFrame* frame, const QPoint& previewPos,BinaryViewRef data, FunctionRef func,
     const ViewLocation& location);
 void BINARYNINJAUIAPI showTextTooltip(QWidget* parent, const QPoint& previewPos, const QString& text);
+void BINARYNINJAUIAPI showTokenTooltip(QWidget* parent, const QPoint& previewPos,
+    const std::vector<std::vector<BinaryNinja::InstructionTextToken>>& lines);
 
 // Interpret the hovered token and, if applicable, displays a tooltip or preview. If no token-driven preview matches
 // and `dataflowFallbackAddress` is set, a dataflow-details tooltip is shown for that address.