Add Market chest and Train station teleport

[RedRafe]

Changes:

1. Added "Teleport to train station" feature: this is a vanilla teleporter that allows players to teleport between train stations as long as they stand nearby a valid train stop and destination is also valid (not ghost) by simply adding a teleport button to vanilla's train stations. Disabled by default.

2. Added "Market chest": market chests can automatically trade items based on their value (in the example, a 2:1 ratio, as per default). To build a market chest, place down a linked chest and it'll be swapped for a buffer chest with the additional GUI.

3. Added new group event to utils/event.lua: on_built, on_destroyed, on_built_tile, & on_mined_tile to bulk register an handler to all built/destroy events

[grilledham]

Sorry for the late review I somehow missed this. But LGTM.

[RedRafe]

No worries, nothing urgent :) Ty