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/V3Common.cpp

@@ -29,6 +29,8 @@
 #include "V3EmitCBase.h"
 #include "V3Global.h"
 
+VL_DEFINE_DEBUG_FUNCTIONS;
+
 //######################################################################
 // Common component builders
 
@@ -117,5 +119,5 @@ void V3Common::commonAll() {
             makeToStringMiddle(classp);
         }
     }
-    V3Global::dumpCheckGlobalTree("common", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 3);
+    V3Global::dumpCheckGlobalTree("common", 0, dumpTree() >= 3);
 }