Rename Subtitle -> Text

Rename Subtitle -> Text

sed -i "s/SubtitleContent/TextContent/g" src/lib/*.cc src/lib/*.h src/wx/*.cc src/wx/*.h src/tools/*.cc test/*.cc
sed -i "s/SubtitleDecoder/TextDecoder/g" src/lib/*.cc src/lib/*.h src/wx/*.cc src/wx/*.h src/tools/*.cc test/*.cc
sed -i "s/subtitle_content/text_content/g" src/lib/*.cc src/lib/*.h src/wx/*.cc src/wx/*.h src/tools/*.cc test/*.cc src/lib/wscript src/wx/wscript
sed -i "s/subtitle_decoder/text_decoder/g" src/lib/*.cc src/lib/*.h src/wx/*.cc src/wx/*.h src/tools/*.cc test/*.cc src/lib/wscript
mv src/lib/subtitle_decoder.cc src/lib/text_decoder.cc
mv src/lib/subtitle_decoder.h src/lib/text_decoder.h
mv src/lib/subtitle_content.cc src/lib/text_content.cc
mv src/lib/subtitle_content.h src/lib/text_content.h
mv src/lib/dcp_subtitle_decoder.cc src/lib/dcp_text_decoder.cc
mv src/lib/dcp_subtitle_decoder.h src/lib/dcp_text_decoder.h
mv src/lib/dcp_subtitle_content.cc src/lib/dcp_text_content.cc
mv src/lib/dcp_subtitle_content.h src/lib/dcp_text_content.h
mv src/lib/text_subtitle_content.cc src/lib/text_text_content.cc
mv src/lib/text_subtitle_content.h src/lib/text_text_content.h
mv src/lib/text_subtitle_decoder.cc src/lib/text_text_decoder.cc
mv src/lib/text_subtitle_decoder.h src/lib/text_text_decoder.h
mv src/wx/timeline_subtitle_content_view.cc src/wx/timeline_text_content_view.cc
mv src/wx/timeline_subtitle_content_view.h src/wx/timeline_text_content_view.h