Add support for Visual Studio 2022

[tobybear]

As with VS2019, to make ZillaLib work with VS2022, some tiny changes need to be made in two files:

File "ZillaApp-vs.props":

• add the following line to the UserMacros section: <VisualStudioYear Condition="'$(VisualStudioVersion)' == '17.0' Or '$(PlatformToolsetVersion)' == '143' Or '$(MSBuildToolsVersion)'== '17.0'">2022</VisualStudioYear>
• add the following line to the platform toolset conditions: <PlatformToolset Condition="'$(VisualStudioYear)' == '2022'">v143$(PlatformToolsetPostfix)</PlatformToolset>

File "ZillaLib-vs.sln":

• add the following line to the UserMacros section: <VisualStudioYear Condition="'$(VisualStudioVersion)' == '17.0' Or '$(PlatformToolsetVersion)' == '143' Or '$(MSBuildToolsVersion)'== '17.0'">2022</VisualStudioYear>