add template in create output path base node

templates for slot are in code but disabled, not useful in the end

properties.py

@@ -0,0 +1,86 @@
+import bpy
+import os
+
+from bpy.types import PropertyGroup
+from bpy.props import StringProperty
+
+
+class RT_PG_render_toolbox_props(PropertyGroup):
+    default_base_path : StringProperty(
+        name="Base Path Template",
+        description="Template for file output base path\
+            \nFolder containing subsequent filepath",
+        default="//render/{node_name}/",
+        # options={'SKIP_SAVE'}
+    )
+
+    ## Multilayer base path :  output on file instead of folder
+    default_multilayer_base_path : StringProperty(
+        name="Base Path Template",
+        description="Template for multilayer file output base paths\
+            \nOutput of the file sequence",
+        default="//render/{node_name}/{node_name}_",
+        # options={'SKIP_SAVE'}
+    )
+
+    ### file slots (not used currently)
+
+    default_file_slot : StringProperty(
+        name="File Slot Template",
+        description="Template for file output file slots\
+            \nSubpath added to base path for file sequence",
+        default="{socket_name}/{socket_name}_",
+        # options={'SKIP_SAVE'}
+    )
+
+    ## Multilayer's layer:  layer name in EXR instead of subpath to file
+    default_multilayer_name : StringProperty(
+        name="Layer Name Template",
+        description="Template for multilayer file output layer names\
+            \nLayer name in EXR multilayer file",
+        default="{socket_name}",
+        # options={'SKIP_SAVE'}
+    )
+
+    # default_tech_pass_name : StringProperty(
+    #     name="Tech Pass Name Template",
+    #     description="Template for tech pass file output layer names\
+    #         \nLayer name in EXR multilayer file",
+    #     default="tech",
+    #     # options={'SKIP_SAVE'}
+    # )
+
+    # default_crypto_name : StringProperty(
+    #     name="Crypto Pass Name Template",
+    #     description="Template for crypto pass file output layer names\
+    #         \nLayer name in EXR multilayer file",
+    #     default="crypto",
+    #     # options={'SKIP_SAVE'}
+    # )
+
+def set_env_properties():
+    ## set default template from environment variable if available
+    exr_base_path_template = os.getenv('RENDERTOOLBOX_EXR_PATH_TEMPLATE')
+    if exr_base_path_template:
+        bpy.context.scene.render_toolbox.default_base_path = exr_base_path_template
+    
+    multilayer_base_path_template = os.getenv('RENDERTOOLBOX_MULTILAYER_PATH_TEMPLATE')
+    if multilayer_base_path_template:
+        bpy.context.scene.render_toolbox.default_multilayer_base_path = multilayer_base_path_template
+
+classes = (
+    RT_PG_render_toolbox_props,
+)
+
+def register():
+    for cls in classes:
+        bpy.utils.register_class(cls)
+    
+    bpy.types.Scene.render_toolbox = bpy.props.PointerProperty(type=RT_PG_render_toolbox_props)
+    set_env_properties()
+
+def unregister():
+    del bpy.types.Scene.render_toolbox
+    
+    for cls in reversed(classes):
+        bpy.utils.unregister_class(cls)