Implement minimal mode

[Dekamir]

As seen on Waila Harvestability (can be toggled):

or ideally, as seen in The One Probe (open by default):

[rdrpenguin04]

Good thought; UI customization would be a nice addition for the future, and it doesn't sound that difficult to implement provided we have a system.

@shedaniel How would it sound to make UI like a logger format string? As an example, "%b\n%y : %t : %l\n%m" for block name, yes/no harvestable, tool, level, and mod respectively. Also, let me know if you'd like me to implement this.