More unused stuff removal (#49)

* More unused stuff removal

delete:
- giant 'metaheaders' (JA2 All.h, Laptop All.h, etc), preferring to add #includes directly where needed
- unused ExceptionHandling and DbMan translation units
- unused WizShare.h, Bitmap.h, trle.h, video_private.h headers

* remove mentions from vc proj files too

* remove preprocessor conditionals for unused definitions

find . -iname '*.h' -o -iname '*.cpp' -exec unifdef.exe -m -UPRECOMPILED_HEADERS -UJA2_PRECOMPILED_HEADERS -UWIZ8_PRECOMPILED_HEADERS -UPRECOMPILEDHEADERS {} ';'

then manually fixed a couple files the tool errored out on

* yes, the comments too

as title

Standard Gaming Platform/SGP_VS2017.vcxproj

@@ -37,7 +37,6 @@
     <ClInclude Include="DirectX Common.h" />
     <ClInclude Include="dsound.h" />
     <ClInclude Include="english.h" />
-    <ClInclude Include="ExceptionHandling.h" />
     <ClInclude Include="expat.h" />
     <ClInclude Include="FileCat.h" />
     <ClInclude Include="FileMan.h" />
@@ -51,7 +50,6 @@
     <ClInclude Include="input.h" />
     <ClInclude Include="Install.h" />
     <ClInclude Include="Ja2 Libs.h" />
-    <ClInclude Include="JA2 SGP ALL.H" />
     <ClInclude Include="LibraryDataBase.h" />
     <ClInclude Include="line.h" />
     <ClInclude Include="MemMan.h" />
@@ -105,7 +103,6 @@
     <ClCompile Include="DirectDraw Calls.cpp" />
     <ClCompile Include="DirectX Common.cpp" />
     <ClCompile Include="English.cpp" />
-    <ClCompile Include="ExceptionHandling.cpp" />
     <ClCompile Include="FileCat.cpp" />
     <ClCompile Include="FileMan.cpp" />
     <ClCompile Include="Flic.cpp" />