Pre & Post build events from Pyro not supported

[megapatato]

Describe the bug
Since v1601138736, Pyro supports PreBuildEvents and PostBuildEvents as elements of the PapyrusProject. The version bundled in this project does not appear to be recent enough to support this.

To Reproduce

1. Generate the default Skyrim Special Edition project files
2. Append the example code from the Pyro documentation:

    <PostBuildEvent Description="Post-Build Event Example" UseInBuild="true">
        <Command>echo Hi! I'm a post-build command!</Command>
    </PostBuildEvent >

3. Error includes:

2021-12-09 ww:xx:yy,zzz [ERRO] Failed to validate XML Schema.
        Element '{PapyrusProject.xsd}PostBuildEvent': This element is not expected., line 24

with line 24 pointing to the PostBuildEvent element.