First attempt at ripping out agnostic code into ifcopenshell.api namespace. See #1399.

src/ifcopenshell-python/ifcopenshell/api/georeference/data.py

@@ -0,0 +1,31 @@
+class Data:
+    is_loaded = False
+    map_conversion = {}
+    projected_crs = {}
+
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.map_conversion = {}
+        cls.projected_crs = {}
+
+    @classmethod
+    def load(cls, file):
+        if not file:
+            return
+        cls.map_conversion = {}
+        cls.projected_crs = {}
+        if file.schema == "IFC2X3":
+            return
+        for context in file.by_type("IfcGeometricRepresentationContext", include_subtypes=False):
+            if not context.HasCoordinateOperation:
+                continue
+            map_conversion = context.HasCoordinateOperation[0]
+            cls.map_conversion = map_conversion.get_info()
+            cls.map_conversion["SourceCRS"] = cls.map_conversion["SourceCRS"].id()
+            cls.map_conversion["TargetCRS"] = cls.map_conversion["TargetCRS"].id()
+            cls.projected_crs = map_conversion.TargetCRS.get_info()
+            if cls.projected_crs["MapUnit"]:
+                cls.projected_crs["MapUnit"] = map_conversion.TargetCRS.MapUnit.get_info()
+            break
+        cls.is_loaded = True