Add Spear of Destiny shareware assets and update project files

- Added new asset files for Spear of Destiny shareware including AUDIOHED.SDM, AUDIOT.SDM, GAMEMAPS.SDM, MAPHEAD.SDM, VGADICT.SDM, VGAGRAPH.SDM, VGAHEAD.SDM, VSWAP.SDM, and documentation files (README.txt, SOD.DOC).
- Included necessary DLLs (SDL.dll, SDL_mixer.dll) for audio support.
- Updated pubspec.yaml to include the new assets directory for Spear of Destiny.
- Enhanced data versioning to recognize Spear of Destiny shareware in data_version.dart.
- Modified registry_resolver.dart to handle asset registry for Spear of Destiny shareware.
- Added license agreements for both id Software and MAME.

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_assets/assets/sod/shareware/license-mame.txt

@@ -0,0 +1,32 @@
+Copyright (c) 1997-2005, Nicola Salmoria and the MAME team
+All rights reserved.
+
+Redistribution and use of this code or any derivative works are permitted
+provided that the following conditions are met:
+
+* Redistributions may not be sold, nor may they be used in a commercial
+product or activity.
+
+* Redistributions that are modified from the original source must include the
+complete source code, including the source code for all components used by a
+binary built from the modified sources. However, as a special exception, the
+source code distributed need not include anything that is normally distributed
+(in either source or binary form) with the major components (compiler, kernel,
+and so on) of the operating system on which the executable runs, unless that
+component itself accompanies the executable.
+
+* Redistributions must reproduce the above copyright notice, this list of
+conditions and the following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.