Revert "board-pico.h: rework memory a *little*"

This reverts commit fabbcb5216da85373718ef336ee0521fc1281b99.
board-pico.h: allow to rework memory a *little* (experimental)

- round off memory allocations by default (shouldn't make much of a difference)
- add *experimental* allocation values!
- add some commenting (will be useful later)
smartassH3: Enable boost pulse by default!