Railcraft bugfixes and a few tweaks

Steam oven added as well.
Thaumcraft content update

Much improved candle
Tweaked infused stone
added saplings
added vis capacitor, nitor, amber, warded glass
added crystals
added arcane door and pressure plates
added levitator, marker and warded stone
added Thaumonomicon
added both particlefields, jar and ice wand projectile