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

src/ifcopenshell-python/ifcopenshell/api/pset_template/remove_pset_template.py

@@ -0,0 +1,14 @@
+import ifcopenshell.util.element
+
+
+class Usecase:
+    def __init__(self, file, settings=None):
+        self.file = file
+        self.settings = {
+            "pset_template": None
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        ifcopenshell.util.element.remove_deep(self.file, self.settings["pset_template"])