memory view fixes, changelog, notes

src/raddbg/raddbg.mdesk

@@ -541,7 +541,7 @@ RD_VocabTable:
       @inherit(tab) x:
     {
       @display_name("Zoom") @description("The zoom level for displaying bytes in the memory view.")
-        @default(1) 'zoom': @range[0.25, 2] f32, 
+        @default(1.0) 'zoom': @range[0.5, 2] f32, 
       @display_name("Base Address") @description("An expression which refers to the base address of data which should be viewed as memory.")
         'expression': expr_string,
       @display_name("Address Range Size") @description("The number of bytes of the viewed memory range.")