Formatting and fixes

* Moved: some existing functions into new separate files to improve code
readability (detailed in __init__.py docstring)

* Remove: max_intersections deprecated in pov 3.8

* Add: Validate utf-8 characters with specific API function at session's
first script init

* Add : Icons to some text fields and inviting labels

* Change default camera normal perturbation value to non zero since its
use is first driven by a boolean toggle

* Change: lists (vectors and indices) are now exported in one line by
default for better manual scene overview and debugging

* Change: a couple of tooltips corrections

* Change : renamed many variables and functions to snake_case according
to recommanded style guides

* Fix : Heightfield primitive (forward slashes were expected for
displacement texture path)

* Fix : Text nippet insertion operator

* Fix : added console print tip to check executable path on failure to
process

* Fix : tweaked finished render say command for Linux

* Fix : interface of some shader nodes broken since 2.8 api changes

* Fix : export hair particles

1 files changed, 57 insertions, 0 deletions

diff --git a/render_povray/scripting_properties.py b/render_povray/scripting_properties.py
new file mode 100755
index 00000000..3e743da3
--- /dev/null
+++ b/render_povray/scripting_properties.py
@@ -0,0 +1,57 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+import bpy
+
+"""Declare pov native file syntax properties controllable in UI hooks and text blocks"""
+
+from bpy.utils import register_class, unregister_class
+from bpy.types import PropertyGroup
+from bpy.props import EnumProperty, PointerProperty
+
+###############################################################################
+# Text POV properties.
+###############################################################################
+
+
+class RenderPovSettingsText(PropertyGroup):
+
+    """Declare text properties to use UI as an IDE or render text snippets to POV."""
+
+    custom_code: EnumProperty(
+        name="Custom Code",
+        description="rendered source: Both adds text at the " "top of the exported POV file",
+        items=(("3dview", "View", ""), ("text", "Text", ""), ("both", "Both", "")),
+        default="text",
+    )
+
+
+classes = (RenderPovSettingsText,)
+
+
+def register():
+    for cls in classes:
+        register_class(cls)
+    bpy.types.Text.pov = PointerProperty(type=RenderPovSettingsText)
+
+
+def unregister():
+    del bpy.types.Text.pov
+    for cls in reversed(classes):
+        unregister_class(cls)