Stuff broke over time, especially with the major changes we made leading
up to 2.3. We should test with older saves if/when we make large changes
in the future.
Fixes#532
static property validationData on classes
PoC/example implemented with HacknetNode:
validates cores is a number in the range between 1 and HacknetNodeConstants.MaxCores
validates level is a number in range between 1 and HacknetNodeConstants.MaxLevel
validates ram is a number in range between 1 and HacknetNodeConstants.MaxRam
validates onlineTimeSeconds in non negative number
validates totalMoneyGenerated is a non negative number