L1VM - stack check

I worked on the stack handling of L1VM. Now I got stack data types check to work! If it is switched on by setting “STACK_CHECK” in settings.h to “1” then it checks the data type on stack at “pull”. So you can avoid errors: pushing an “int64” on top and say pop a “byte” gives a runtime error. So the stack errors can be found easy. The L1VM is now at version 1.5. And stack check is on by default.