deprecate builtin readparam & statusup2
Created by: Helianthella
First of all, this PR deprecates the readparam builtin because it is integrated into the get_val (internal) builtin. This means that if const.txt in server-data is set properly you can directly get properties like Int without the need for readparam.
Secondly, I have made the set builtin do the same thing as statusup2 when using params (does not affect normal variables).
This means that you can do things like set Str, Str - 9; and it will work as you would expect it to.
_Note:_ The params are in the form Val but for bonus you need to use the form bVal. For example: bonus bInt, -Int;. This is because bVal is an integer but Val is a param (so it returns the value). Therefore bVit always equals 15 but Vit equals the actual vitality.