Log Message:
Update to 0.19.6

Changelog:
Bugfixes

    Fixed “32 bit signed xor broken on VM” (#10482)
    Fixed “SetMaxPoolSize not heeded” (#10584)
    Fixed “uint inplace add in if branch is omitted when compiled to JS” (#10697)
    Fixed “Booleans Work Wrong in Compile-time” (#10886)
    Fixed “Bug in setTerminate()” (#10765)
    Fixed “Cannot raise generic exception” (#7845)
    Fixed “Nim string definition conflicts with other C/C++ instances” (#10907)
    Fixed “std/json fails to escape most non-printables, breaking generation \ 
and parsing” (#10541)
    Fixed “object self-assignment order-of-evaluation broken” (#9844)
    Fixed “Compiler crash with generic types and static generic parameters” \ 
(#7569)