Added TextLink(), TextLinkOpenURL() hyperlink widgets. (#7660)

imgui.h

@@ -543,6 +543,8 @@ namespace ImGui
     IMGUI_API bool          RadioButton(const char* label, int* v, int v_button);           // shortcut to handle the above pattern when value is an integer
     IMGUI_API void          ProgressBar(float fraction, const ImVec2& size_arg = ImVec2(-FLT_MIN, 0), const char* overlay = NULL);
     IMGUI_API void          Bullet();                                                       // draw a small circle + keep the cursor on the same line. advance cursor x position by GetTreeNodeToLabelSpacing(), same distance that TreeNode() uses
+    IMGUI_API bool          TextLink(const char* label);                                    // hyperlink text button, return true when clicked
+    IMGUI_API void          TextLinkOpenURL(const char* label, const char* url = NULL);     // hyperlink text button, automatically open file/url when clicked
 
     // Widgets: Images
     // - Read about ImTextureID here: https://github.com/ocornut/imgui/wiki/Image-Loading-and-Displaying-Examples
@@ -1613,6 +1615,7 @@ enum ImGuiCol_
     ImGuiCol_TableBorderLight,      // Table inner borders (prefer using Alpha=1.0 here)
     ImGuiCol_TableRowBg,            // Table row background (even rows)
     ImGuiCol_TableRowBgAlt,         // Table row background (odd rows)
+    ImGuiCol_TextLink,              // Hyperlink color
     ImGuiCol_TextSelectedBg,
     ImGuiCol_DragDropTarget,        // Rectangle highlighting a drop target
     ImGuiCol_NavHighlight,          // Gamepad/keyboard: current highlighted item