moved thumbnail generation to plugin; extended plugin loading for pre and post window loading

plugins/thumbnailer/icons/mixins/meshsiconmixin.py

@@ -0,0 +1,17 @@
+# Python imports
+import subprocess
+
+# Lib imports
+
+# Application imports
+
+
+
+
+class MeshsIconMixin:
+    def generate_blender_thumbnail(self, full_path, hash_img_path):
+        try:
+            proc = subprocess.Popen([self.BLENDER_THUMBNLR, full_path, hash_img_path])
+            proc.wait()
+        except Exception as e:
+            logger.debug(repr(e))