Spatial manager elevation in projects units and some bug fixed

1) Elevation prop now is taking into account project units (previously it was hardcoded to meters)
2) Fixed a bug that occured when you started changing spatial element name/elevation right after you loaded spatial manager.

https://i.imgur.com/1keMGus.png

src/blenderbim/blenderbim/bim/module/spatial/prop.py

@@ -32,6 +32,7 @@ from bpy.props import (
 )
 import blenderbim.tool as tool
 import blenderbim.core.geometry
+import ifcopenshell
 
 
 def update_elevation(self, context):
@@ -43,9 +44,10 @@ def update_elevation(self, context):
 
 
 def update_active_container_index(self, context):
+    si_conversion = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
     self.active_container_id = self.containers[self.active_container_index].ifc_definition_id
     self.container_name = self.containers[self.active_container_index].name
-    self.elevation = self.containers[self.active_container_index].elevation
+    self.elevation = self.containers[self.active_container_index].elevation * si_conversion
 
 
 def updateContainerName(self, context):
@@ -90,5 +92,5 @@ class BIMSpatialManagerProperties(PropertyGroup):
     active_container_index: IntProperty(name="Active Container Index", update=update_active_container_index)
     active_container_id: IntProperty(name="Active Container Id")
     container_name: StringProperty(name="Container Name")
-    elevation: FloatProperty(name="Elevation", update=update_elevation)
+    elevation: FloatProperty(name="Elevation", update=update_elevation, subtype="DISTANCE")
     is_container_update_enabled: BoolProperty(name="Is Container Update Enabled", default=True)  # TODO:review

src/blenderbim/blenderbim/tool/spatial.py

@@ -207,6 +207,8 @@ class Spatial(blenderbim.core.tool.Spatial):
             if object.is_a("IfcSpatialElement") or object.is_a("IfcSpatialStructureElement"):
                 cls.create_new_storey_li(object, 0)
         cls.props.is_container_update_enabled = True
+        # triggers spatial manager props setup
+        cls.props.active_container_index = 0
 
     @classmethod
     def create_new_storey_li(cls, element, level_index):