Streamline dump control options

- Rename `--dump-treei` option to `--dumpi-tree`, which itself is now a
  special case of `--dumpi-<tag>` where tag can be a magic word, or a
  filename
- Control dumping via static `dump*()` functions, analogous to `debug()`
- Make dumping independent of the value of `debug()` (so dumping always
  works even without the debug flag)
- Add separate `--dumpi-graph` for dumping V3Graphs, which is again a
  special case of `--dumpi-<tag>`
- Alias `--dump-<tag>` to `--dumpi-<tag> 3` as before

src/V3HierBlock.cpp

@@ -86,6 +86,8 @@
 #include <utility>
 #include <vector>
 
+VL_DEFINE_DEBUG_FUNCTIONS;
+
 static string V3HierCommandArgsFileName(const string& prefix, bool forCMake) {
     return v3Global.opt.makeDir() + "/" + prefix
            + (forCMake ? "_hierCMakeArgs.f" : "_hierMkArgs.f");
@@ -302,7 +304,6 @@ public:
         : m_planp{planp} {
         iterateChildren(netlist);
     }
-    VL_DEBUG_FUNC;  // Declare debug()
 };
 
 //######################################################################