Use canonical format for MSVS project/solution files

Use the same format as is used by MSVS itself to avoid spurious changes when
modifying the files. Notably:

- Use DOS end of line format (0D 0A).
- Add UTF-8 BOM (EF BB BF) to the beginning of the files.
- Do not put CR LF at the end of the last line in the file.

Closes https://github.com/wxWidgets/wxWidgets/pull/440

build/msw/wx_core.vcxproj

@@ -1384,4 +1384,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>