Re-enable DebugText and DebugTextStacking

[MattFiler]

Currently the DebugText and DebugTextStacking entities are disabled at an engine level, it'd be very helpful for building scripts to have them re-enabled in some capacity.

[MattFiler]

Spent today looking into this - hooking the entity's create function reveals they are seemingly correctly created, but then any further calls to things such as on_start never happen. The EntityManager call_entity_method never fires for any linked events to these entities either, suggesting that their logic is blocked at another level.

There appears to be calls to state_change which set flags on the entities, perhaps disabling their functionality. Need to dig into this further, and also try to retrieve parameter data from the entities by using their handle to see if they are just fully deleted, or simply have a flag set that is stopping them from operating.