Fix example python scripts to work in the UI as well

* In the UI program we can't import renderdoc (it's already imported) so we just
  alias it to rd.

docs/python_api/examples/renderdoc/decode_mesh.py

@@ -1,4 +1,11 @@
-import renderdoc as rd
+import sys
+
+# Import renderdoc if not already imported (e.g. in the UI)
+if 'renderdoc' not in sys.modules and '_renderdoc' not in sys.modules:
+	import renderdoc
+
+# Alias renderdoc for legibility
+rd = renderdoc
 
 # We'll need the struct data to read out of bytes objects
 import struct

docs/python_api/examples/renderdoc/display_window.py

@@ -1,4 +1,11 @@
-import renderdoc as rd
+import sys
+
+# Import renderdoc if not already imported (e.g. in the UI)
+if 'renderdoc' not in sys.modules and '_renderdoc' not in sys.modules:
+	import renderdoc
+
+# Alias renderdoc for legibility
+rd = renderdoc
 
 def loadCapture(filename):
 	# Open a capture file handle

docs/python_api/examples/renderdoc/fetch_counters.py

@@ -1,4 +1,11 @@
-import renderdoc as rd
+import sys
+
+# Import renderdoc if not already imported (e.g. in the UI)
+if 'renderdoc' not in sys.modules and '_renderdoc' not in sys.modules:
+	import renderdoc
+
+# Alias renderdoc for legibility
+rd = renderdoc
 
 draws = {}
 

docs/python_api/examples/renderdoc/fetch_shader.py

@@ -1,4 +1,11 @@
-import renderdoc as rd
+import sys
+
+# Import renderdoc if not already imported (e.g. in the UI)
+if 'renderdoc' not in sys.modules and '_renderdoc' not in sys.modules:
+	import renderdoc
+
+# Alias renderdoc for legibility
+rd = renderdoc
 
 def printVar(v, indent = ''):
 	print(indent + v.name + ":")

docs/python_api/examples/renderdoc/iter_draws.py

@@ -1,4 +1,11 @@
-import renderdoc as rd
+import sys
+
+# Import renderdoc if not already imported (e.g. in the UI)
+if 'renderdoc' not in sys.modules and '_renderdoc' not in sys.modules:
+	import renderdoc
+
+# Alias renderdoc for legibility
+rd = renderdoc
 
 # Define a recursive function for iterating over draws
 def iterDraw(d, indent = ''):

docs/python_api/examples/renderdoc/save_texture.py

@@ -1,4 +1,11 @@
-import renderdoc as rd
+import sys
+
+# Import renderdoc if not already imported (e.g. in the UI)
+if 'renderdoc' not in sys.modules and '_renderdoc' not in sys.modules:
+	import renderdoc
+
+# Alias renderdoc for legibility
+rd = renderdoc
 
 # Recursively search for the drawcall with the most vertices
 def biggestDraw(prevBiggest, d):