Start work on an generic implementation for showing fitting/drone/implant/booster/etc. view columns.

gui/builtinViewColumns/__init__.py

@@ -0,0 +1,8 @@
+__all__ = ["moduleState", "moduleNameOrSlot"]
+
+columns = {}
+def registerColumn(column):
+    columns[column.name] = column
+
+def getColumn(name):
+    return columns[name]