Removed unused files (colobot/#182)
Added new Intro music (by PiXeL)
Changed to sound & music folders

* Removed unused sounds
* Added flac verion of music
I won't remove music in ogg until we'll setup conversion in CMake
music???.ogg in better quality (vorbis q8)
Merge branch 'dev' of github.com:colobot/colobot-data into dev
Updated Intro music

Intro1.ogg - played only once at the beginning
Intro2.ogg - played in loop directly after Intro1.ogg
Fixed free801.txt and free901.txt titles

They were in French
Added win???.txt to gen_levels_xml.sh

There's nothing to translate, but they weren't copied by "make install". Lost files are also translated.
Scripts for non-power-of 2 textures
Resized textures to power-of-2 dimensions

 * resized textures do not look nice, but
   they will work regardless of graphics card/drivers
Cropped background images back to original dimensions

 * the textures are now non-power-of-2, but the graphics
   engine will fix that in runtime
Updated gitignore
Merge from dev (Colobot Gold 0.1.0-alpha)