1.5.2 - Optimize file/cache operations

Merge branch '1.5.2'

1.5.1 - Fix mod save overlap

Fix saving on quit to menu
Fix static fields causing save overlap

1.5.0 - NuGet Build

https://www.nuget.org/packages/stblade.Modding.TLD.ModData/1.5.0

Pre-Release 1.2.0

return bool for save methods & update readme