Make funnels collect water automatically.

[gmcnew]

With this change, to collect rainwater, you activate a funnel and then drop a water-tight, sealable container onto its tile. Then you wait. The funnel will try to add rainwater to a container on its tile. (If multiple containers are present, it uses the largest one which is (1) water-tight and sealable and (2) doesn't contain a liquid other than water or acid.)

Dropping multiple containers on a tile won't help you, because the funnel won't switch automatically.

If a funnel is exposed to rain as well as acid rain before the container is collected, the liquid in the container may change to "weak acid water". This means you should try to pick up a water container very soon after it becomes full. (If water is exposed to acid rain and doesn't turn into weak acid water, it may become more poisoned instead, but boiling takes care of that.)

A funnel should collect around 14 charges of water per hour when it's raining, or 7 or so charges per hour during a drizzle. A makeshift funnel is easy to craft but is much smaller than a regular funnel and only collects 1% as much water.

[CataJenkins]

Build successful!
Refer to this link for build results: http://ci.narc.ro/job/Cataclysm-PullRequests/552/

[KA101]

Dunno about this one. More realistic, sure, but also more tedious. Seems like we'd have to manually wait around for the bottles to fill.

Perhaps keep the current funnel-activation, but make it take time instead, with an abort prompt for weather change?

[kevingranade]

The current function was only a stopgap until someone got around to
implementing this version. You don't generally wait around, you go do
something else, like craft, sleep, or read.

A later update will allow you to leave the area and still have them fill.

[ianestrachan]

This is actually how I tried to use funnels the first time I found them, and makes much more sense, so I'm glad to see it.

Put down a funnel and a steel jerrycan and you're all set... as long as it doesn't turn into acid rain.

[kevingranade]

Along with some very nice trap handling cleanups, thank you!

[CataJenkins]

Build successful!
Refer to this link for build results: http://ci.narc.ro/job/Cataclysm-PullRequests/577/

[gmcnew]

Okay, I think this is good to go. =) (I didn't use the [WIP] tag because I thought it was pull-ready from the beginning.)

[CataJenkins]

Build successful!
Refer to this link for build results: http://ci.narc.ro/job/Cataclysm-PullRequests/578/