pylonsrc: merge Basler Pylon plugin from gst-pylonsrc

Merged from https://github.com/zingmars/gst-pylonsrc

This includes some changes to include running gst-indent, and
modification to allow it to compile with Visual Studio 2012/VC11.

cmake/modules/FindPylon.cmake

@@ -0,0 +1,32 @@
+# - Try to find Pylon SDK
+# Once done this will define
+#
+#  PYLON_FOUND - system has Pylon SDK
+#  PYLON_INCLUDE_DIR - the Pylon SDK include directory
+#  PYLON_LIBRARIES - the libraries needed to use Pylon SDK
+
+# Copyright (c) 2006, Tim Beaulen <tbscope@gmail.com>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+if (NOT PYLON_DIR)
+    set (PYLON_DIR "C:/Program Files/Basler/pylon 5" CACHE PATH "Directory containing Pylon SDK includes and libraries")
+endif ()
+
+find_path (PYLON_INCLUDE_DIR pylonc/PylonC.h
+    PATHS
+    "${PYLON_DIR}/Development/include"
+    DOC "Directory containing KYFGLib.h include file")
+
+# TODO: support multiple SDK versions
+find_library (_PylonCLib NAMES PylonC_MD_VC120
+    PATHS
+    "${PYLON_DIR}/Development/lib/x64")
+
+set (PYLON_LIBRARIES ${_PylonCLib})
+
+mark_as_advanced (_PylonCLib)
+
+include (FindPackageHandleStandardArgs)
+find_package_handle_standard_args (PYLON  DEFAULT_MSG  PYLON_INCLUDE_DIR PYLON_LIBRARIES)