BColumnListView: BRow height is proportional to font size.

* Add a BRow default constructor that use font size to compute height.
* Min height size for Title and Row are decoupled.
* The font ratio for Title and Row are decoupled.
* For small font use min height (set to usual 16.0).
* Better baseline formula.
* Fixes #11944.

headers/private/interface/ColumnListView.h

@@ -121,7 +121,8 @@ public:
 // a parent of a row, using the AddRow() function in BColumnListView().
 class BRow {
 public:
-								BRow(float height = 16.0);
+								BRow();
+								BRow(float height);
 	virtual 					~BRow();
 	virtual bool		 		HasLatch() const;