Adds more zone-wide effects in. About half of them explain special level mechanics, the rest are just for flavour or some minor gameplay spice.

Simplified support of double shields by enhancing actor:hasShield()

Sometiems, rarely, a special room will appear in the Infinite Dungeon to let you access the Item's Vault (if you have it active and are a donator)

Merge branch 'value_scroller' of http://git.net-core.org/0player/t-engine4 into 0player/t-engine4-value_scroller

Entity resolve

* Allows certain simple resolvers to be resolved immediately when encountered (set .__resolve_instant = true).
This fixes a problem with some nested resolvers not being resolved completely before other resolvers are processed.
(This shows up with steam giant's melee_project.FIRE being incompletely resolved while the equipment resolver is run with gear that modifies this field.)

Allows certain simple resolvers to be resolved immediately when encountered (set .__resolve_instant = true).
This fixes a problem with some nested resolvers not being resolved completely before other resolvers are processed.
(This shows up with steam giant's melee_project.FIRE being incompletely resolved while the equipment resolver is run with gear that modifies this field.)

also most code stolen from separator