before modelling stack
added Stack.v
..
add threadRegister & finish init_context
ready for switch_context
before adding HardwareThread to Thread
Some get & set functions; add init_context into Thread_cstr
Some get & set functions; add init_context into Thread_cstr
Some get & set functions; add init_context into Thread_cstr
ready for load_context
Merge branch 'StackAsList' of github.com:VEROS/VEROS into StackAsList