Cleanup memory manager

[momo5502]

This is tightly coupled to #14.
Currently, the emulator interface inherits the memory_manager interface. That's bad. The memory_manager implements windows specific functionality and should thus be part of the windows_emulator.

[momo5502]

The emulator interface would therefore need to expose the 3 requried APIs:

virtual void map_memory(uint64_t address, size_t size, memory_permission permissions) = 0;
virtual void unmap_memory(uint64_t address, size_t size) = 0;
virtual void apply_memory_protection(uint64_t address, size_t size, memory_permission permissions) = 0;

A consequence would be that this introduces a level of abstraction by moving things to the windows_emulator. Thus requiring a second level of virtual function calls. That's bad. CRTP should be the solution to this, to eliminate at least one level of virtual calls.