Dropped tab layout, floating info window and clean

No longer using tabs, all info in one bottom panel.
Added a floating info window, can open from control bar.
Cleanup vertical widths for scroll bars in some panes.

src/simulator/gui_tab_memory.odin

@@ -54,7 +54,7 @@ gui_tab_memory :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 
     content_rect := rl.Rectangle{
         0, 0,
-        rect.width - 12,
+        rect.width - 15,
         f32(MEM_VIRTUAL_ROWS) * MEM_ROW_H,
     }