mapArtMode consider blocks under gravity blocks and those that require blocks

## Describe your suggestion
When `mapArtMode ` is active, also consider blocks underneath gravity blocks (sand, gravel, anvils, etc.) and blocks that require a support (carpets, snow layers, etc.)

## Settings
`placeSupports` - Whether or not baritone should place blocks underneath blocks that need it.
`supportsRequired` - A list of blocks that require a block underneath
And perhaps maybe another option to specify if baritone should use a block in `acceptableThrowawayItems` or the block specified in the schematic.

## Context
When building map art, certain blocks require a block to be placed under it. Currently, baritone tries endlessly to place the block but to no success.

## Final checklist
- [x] I know how to properly use check boxes
- [x] I have not used any OwO's or UwU's in this issue.