patch [#33609] Syntax highlighting for OSL in Text Editor

from Patrick Boelens (senshi). with modifications to split it into its own function.

also added C style multi-line comment support /* ... */

I've left out the part of this patch that sets the language in the space, since I think this might be better stored in the text block.

For now it simply uses OSL syntax highlighting when the extension is '.osl'.

doc/python_api/sphinx_doc_gen.py

@@ -612,6 +612,10 @@ def pyfunc2sphinx(ident, fw, identifier, py_func, is_class=True):
     '''
     function or class method to sphinx
     '''
+    
+    if type(py_func) == type(bpy.types.Space.draw_handler_add):
+        return
+    
     arg_str = inspect.formatargspec(*inspect.getargspec(py_func))
 
     if not is_class: