fix: Add System assembly reference for DataTable in ColorSplasher

The DataTable class was not properly imported because the System assembly
was not referenced. Added clr.AddReference('System') to fix the issue.

Fixes #2564

Author: devloai[bot]

extensions/pyRevitTools.extension/pyRevit.tab/Analysis.panel/ColorSplasher.pushbutton/script.py

@@ -27,6 +27,7 @@
 from pyrevit.script import get_logger
 import clr
 clr.AddReference('System.Data')
+clr.AddReference('System')
 from System.Data import DataTable