Allow to install ifcpatch separately (#1263)

Will allow to provide ifcpatch as a standard python package for
various usages (eg. standalone, blenderbim addon, FreeCAD)
* Copy folder instead of files [using svn](https://stackoverflow.com/a/18194523/4098083)
* Fetch recipes from ifcpatch module path

src/ifcblenderexport/Makefile

@@ -266,21 +266,7 @@ endif
 	rm -rf dist/working
 
 	# Provides IFCPatch functionality
-	cd dist/blenderbim/libs/site/packages/ && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/ifcpatch.py
+	cd dist/blenderbim/libs/site/packages/ && svn export https://github.com/IfcOpenShell/IfcOpenShell/trunk/src/ifcpatch
-	cd dist/blenderbim/libs/site/packages/ && mkdir recipes
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/__init__.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/ExtractElements.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/MergeProject.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/Migrate.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/OffsetObjectPlacements.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/OffsetStoreyElevations.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/Optimise.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/RecycleNonRootedElements.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/RemoveSiteRepresentation.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/ResetAbsoluteCoordinates.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/ResetSpatialElementLocations.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/SetRefElevation.py
-	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/SplitByBuildingStorey.py
 
 	cd dist/blenderbim && sed -i "s/999999/$(VERSION)/" __init__.py
 	cd dist && zip -r blender28-bim-$(VERSION)-$(PLATFORM).zip ./*

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -1,7 +1,8 @@
 import json
 import os
-import ifcopenshell
 from pathlib import Path
+import importlib
+import ifcopenshell
 from . import export_ifc
 from . import schema
 from . import ifc
@@ -319,7 +320,8 @@ def getIfcPatchRecipes(self, context):
     global ifcpatchrecipes_enum
     if len(ifcpatchrecipes_enum) < 1:
         ifcpatchrecipes_enum.clear()
-        for filename in Path(os.path.join(cwd, "..", "libs", "site", "packages", "recipes")).glob("*.py"):
+        ifcpatch_path = Path(importlib.util.find_spec("ifcpatch").submodule_search_locations[0])
+        for filename in ifcpatch_path.joinpath("recipes").glob("*.py"):
             f = str(filename.stem)
             if f == "__init__":
                 continue