demos/cubeline: Post-SVN tidy

- Move source code from `trunk` into root directory.
- Update build files.

data/Tupfile.lua

@@ -750,7 +750,7 @@ tup.append_table(img_files, {
  -- {"LIB/MTAR.OBJ", VAR_PROGS .. "/develop/libraries/microtar/mtar.obj"},
 })
 tup.append_table(extra_files, {
--- {"kolibrios/3D/cubeline", VAR_PROGS .. "/demos/cubeline/trunk/cubeline"},
+-- {"kolibrios/3D/cubeline", VAR_PROGS .. "/demos/cubeline/cubeline"},
  {"kolibrios/3D/gears", VAR_PROGS .. "/demos/gears/gears"},
  {"kolibrios/emul/e80/e80", VAR_PROGS .. "/emulator/e80/e80"},
  {"kolibrios/emul/uarm/", VAR_CONTRIB .. "/other/uarm/uARM"},