Implement primitives:
[ ] VM_PARAMETER = 254
[ ] PRIM_PATH_NAME_DELIMITER = 161
[ ] SET_INTERRUPT_KEY = 133
[ ] SPECIAL_OBJECTS_ARRAY = 129
[ ] LOW_SPACE_SEMAPHORE = 124
[ ] INTERRUPT_SEMAPHORE = 134
[ ] SIGNAL_AT_BYTES_LEFT = 125
[ ] IMAGE_NAME = 121
[ ] BE_CURSOR  = 101
[ ] BE_DISPLAY = 102

Interpreter:
[ ] Replace hardcoded fallback selectors with selectors from SpecialSelectorsArray
[ ] Wrapper for SpecialSelectorsArray
[ ] Wrapper for SpecialObjectTable as replacement for classtable and objecttable
[ ] Implement context rewinding

Squeakimage:
[ ] Implement image writer

Shadows:
[ ] Fix invalidation of methoddictshadow when the w_self of its values array changes
