stub out visualizer tab view hooks for bitmap, geo, text, disasm viewers; pass down cfg node trees for open-tab command; visualize query string in tab titles

src/df/core/df_core.mdesk

@@ -88,6 +88,7 @@ DF_CmdParamSlotTable:
   {TextPoint         text_point            `TxtPt`}
   {CmdSpec           cmd_spec              `struct DF_CmdSpec *`}
   {ViewSpec          view_spec             `struct DF_ViewSpec *`}
+  {CfgNode           cfg_node              `struct DF_CfgNode *`}
   {VirtualAddr       vaddr                 `U64`}
   {VirtualOff        voff                  `U64`}
   {Index             index                 `U64`}