Implement many Tcl_*Var* functions and Tcl_GetIndexFromObj as (faster/stack-saving) macros around resp their Tcl_*Var*2 equivalent and Tcl_GetIndexFromObjStruct
Implement many Tcl_*Var* functions and Tcl_GetIndexFromObj as (faster/stack-saving) macros around resp their Tcl_*Var*2 equivalent and Tcl_GetIndexFromObjStruct