Expose a DisplayBepInExVersion

[js6pak]

Description

Moves the stripping of version build info from ChainloaderLogHelper to a public property

As @ghorsington noted it probably shouldn't be in Paths though, I don't see any existing type good for this, so where should this be?

Motivation and Context

#546 and mods that might want to display the bepinex version

[ManlyMarco]

If the build version is only meant to be used in one place then why not just strip the build number there? Also personally I'd rather keep the build number visible in the console title but that's just me.

Edit: Ah, if other plugins want to use this version then why not add an extension method for stripping the build number? Having a second barely different version property just seems like an overkill to me.