Allow Baritone to place temporary block while building schematics

## Describe your suggestion
While building schematics, Baritone refuses to place temporary blocks and instead makes the player do it. This means that Baritone can't place any block that's floating, and it VERY annoying. This also means that baritone can't place half slabs unless there are blocks around the half slab. (like if there's a platform, it won't be able to place a top half slab on top of it.)

## Settings
You can toggle this on or off with something like #placetempblocks, or just have it always be able to place temporary blocks.

## Context
This would mean that Baritone won't have to wait for the user to place temporary blocks for it in order to build the schematic fully.