Write tests for Framework modules

[zpl-zak]

The following modules need to have tests written:

• Interpolator
• World ECS system
• Scripting engine
• Networking engine (basic connection init/shutdown + packet flow)
• HTTP server (validate endpoints)
• scripting bindings

[zpl-zak]

UTs currently crash as the node.js engine is not yet re-entrant. Blocked by #81

[Segfaultd]

Scripting engine test fixed