* added SConstruct file in root, updated other SConscript files

* build will call nifxml_swig.py and nifxml_niflib.py
* removed legacy swig interface generating code from niflib_niflib.py
* removed pyniflib.i_old and obj_common.i since they are no longer used
* set eol-style to native on some files in niflib/src/gen for linux compatibility
* removed svn:externals property on contrib/niflib/pywrap as it is no longer needed

SConscript

+Import('*')
+
+# set up environment
+
+env_niflib = env.Copy()
+
+if sys.platform == 'win32':
+    env_niflib.Append(CCFLAGS = '/D "BUILDING_NIFLIB_DLL"')
+else:
+    env_niflib.Append(CCFLAGS = '-DBUILDING_NIFLIB_DLL')
+
+# generate code
+
+os.system('cd ' + os.path.join('..', 'docsys') + ' && python nifxml_niflib.py -p ' + os.path.join('..' , 'niflib'))
+
+# list source files
+
+src_files = []
+
+for n in nifxml.compound_names:
+    x = nifxml.compound_types[n]
+    if n[:3] != 'ns ' and not x.niflibtype and not x.template:
+        src_files.append('src/gen/' + str(n) + '.cpp')
+
+for n in nifxml.block_names:
+    src_files.append('src/obj/' +  str(n) + '.cpp')
+
+src_files.extend(Split("""
+src/ComplexShape.cpp
+src/niflib.cpp
+src/nif_math.cpp
+src/NIF_IO.cpp
+src/kfm.cpp
+src/Type.cpp
+src/gen/obj_factories.cpp
+src/gen/enums.cpp
+src/gen/obj_impl.cpp
+TriStripper/connectivity_graph.cpp
+TriStripper/policy.cpp
+TriStripper/tri_stripper.cpp
+NvTriStrip/NvTriStrip.cpp
+NvTriStrip/NvTriStripObjects.cpp
+NvTriStrip/VertexCache.cpp
+"""))
+
+# build niflib
+
+niflib = env_niflib.SharedLibrary('niflib', src_files)
+
+Export('niflib')