Fixes and enhancements

- Row: Row SVG groups are now positioned relatively to their Row's
base/resize line. Added some documentation

- Word/WordTag: Fixed positioning to be relative to Row's baseline.
Fixed alignment issues. Removed extraneous padding/spacing.  Added some
documentation.

- Brat parser: Fixed issue with empty tokens being added as Words.

- Config: Added more configuration options.

- Build: Fixed bug in `runfile.js` (watch task previously failed to
detect changes to core TAG styles)

- Broke compatibility with original TAG `main.js` somewhere around here
or the previous commit (probably with the introduction of the
per-instance Config object)

Author: ZechyW

demo/data/simple-brat.ann

@@ -0,0 +1,3 @@
+Word VeryLongWord
+T1 Tag 0 4 Word
+T2 LongLongLongTag 5 17 VeryLongWord

demo/demo.min.js

@@ -60,6 +60,11 @@ $(async () => {
     format: "json"
   });
 
+  // Debug
+  window.basicTag = basicTag;
+  // await basicTag.loadUrlAsync("data/simple-brat.ann", "brat");
+  return;
+
   // -------------------
   // Advanced/UI example
   // -------------------