fluid system overhaul

[The4codeblocks]

autocrafter fluid support
creative fluid source
trashcan acting as fluid void
flow sensor acting as a pressure gauge (shows fluid type too)
multiple fluid types (no mixing, but there is displacement)
| has custom fluid registration
| updating existing pump and drains to support multiple fluids
| per fluid "finite" config

(important detail: flow logic default set to "pressure" instead of "classic")

[BuckarooBanzay]

how does that affect existing worlds?

[The4codeblocks]

a lot of the things I'm doing (whether they're currently in this PR or not) are going to break things, but the old way things work is likely simple enough to auto-reinstate the original function

[BuckarooBanzay]

Current luacheck warnings: (i removed the ones about missing core global)

Checking autocrafter.lua                          12 warnings

    autocrafter.lua:5:1: inconsistent indentation (SPACE followed by TAB)
    autocrafter.lua:17:1: line contains only whitespace
    autocrafter.lua:24:1: line contains only whitespace
    autocrafter.lua:181:1: line contains only whitespace
    autocrafter.lua:194:1: line contains only whitespace

 Checking common.lua                               1 warning

    common.lua:223:9: unused variable inv_size

Checking trashcan.lua                             2 warnings

    trashcan.lua:48:2: value assigned to field after_place_node is overwritten on line 53 before use
    trashcan.lua:49:2: value assigned to field after_dig_node is overwritten on line 56 before use

sounds good imo, didn't test that yet though

[The4codeblocks]

feature set in desc updated