DGEngine v0.1.17

Release for Windows

- players are no longer passable
- refactor items/players to use int32_t properties instead of int16_t
- update pathFinder code
- update player code
- update properties
- update walk code
- use stint16 everywhere

- update gamefiles (player now walks at normal speed, etc)

Note: This is a work in progress. Some things aren't perfect and that's known.
Delete previous saves to avoid error caused by changes.