VM: Remove empty source files
VM: Refactor aging_collector to Factor style
VM: Refactor aging_space to Factor style
VM: Refactor alien.cpp to Factor style
VM: Refactor allot.hpp to Factor style
VM: Refactor arrays.cpp/hpp to Factor style
VM: Refactor assert.hpp to Factor style
VM: Refactor atomic-* to Factor style
VM: Refactor atomic.hpp to Factor style
VM: Refactor bignum to Factor style
VM: Refactor bitwise_hacks to Factor style
VM: Refactor booleans.hpp to Factor style
VM: Refactor bump_allocator.hpp to Factor style
VM: Refactor byte_arrays to Factor style
VM: Refactor callbacks to Factor style
VM: Refactor callstack to Factor style
VM: Refactor code_blocks to Factor style
VM: Refactor code_heap to Factor style
VM: Refactor code_roots to Factor style
VM: Refactor collector.hpp to Factor style