fix many implicit ifcopenshell.guid imports

a bit related to 10d30b0de

src/blenderbim/test/tool/test_brick.py

@@ -22,6 +22,7 @@ import brickschema
 import brickschema.persistent
 from brickschema.namespaces import REF, A
 import ifcopenshell
+import ifcopenshell.guid
 import blenderbim.core.tool
 import blenderbim.tool as tool
 from rdflib.namespace import RDF

src/blenderbim/test/tool/test_drawing.py

@@ -21,6 +21,7 @@ from pathlib import Path
 import bpy
 import mathutils
 import ifcopenshell
+import ifcopenshell.guid
 import blenderbim.core.tool
 import blenderbim.tool as tool
 from test.bim.bootstrap import NewFile