Rewritten StreamTexture for better code reuse, added basis universal support

modules/basis_universal/SCsub

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+import string
+
+Import('env')
+Import('env_modules')
+
+env_bu = env_modules.Clone()
+env_bu.Append(CPPPATH=["#thirdparty/basis_universal", "#thirdparty/basis_universal/transcoder"])
+
+if env['target'] == "debug":
+	env_bu.Append(CPPFLAGS=["-DBASISU_DEVEL_MESSAGES=1", "-DBASISD_ENABLE_DEBUG_FLAGS=1"])
+
+tool_sources = string.split("""
+	#thirdparty/basis_universal/basisu_astc_decomp.cpp
+	#thirdparty/basis_universal/basisu_backend.cpp
+	#thirdparty/basis_universal/basisu_basis_file.cpp
+	#thirdparty/basis_universal/basisu_comp.cpp
+	#thirdparty/basis_universal/basisu_enc.cpp
+	#thirdparty/basis_universal/basisu_etc.cpp
+	#thirdparty/basis_universal/basisu_frontend.cpp
+	#thirdparty/basis_universal/basisu_global_selector_palette_helpers.cpp
+	#thirdparty/basis_universal/basisu_gpu_texture.cpp
+	#thirdparty/basis_universal/basisu_pvrtc1_4.cpp
+	#thirdparty/basis_universal/basisu_resample_filters.cpp
+	#thirdparty/basis_universal/basisu_resampler.cpp
+	#thirdparty/basis_universal/basisu_ssim.cpp
+	#thirdparty/basis_universal/basisu_tool.cpp
+	#thirdparty/basis_universal/lodepng.cpp
+	""")
+
+transcoder_sources = ["#thirdparty/basis_universal/transcoder/basisu_transcoder.cpp"]
+
+if env['tools']:
+	env_bu.add_source_files(env.modules_sources, tool_sources)
+
+env_bu.add_source_files(env.modules_sources, transcoder_sources)
+
+env_bu.add_source_files(env.modules_sources, "*.cpp")