- removed need of surface for homemade trowel, hacksaw, garden saw, pickaxe,
making bleach still needs surface

- removed sharp knife requirement for homemade trowel, hacksaw, garden saw,
added homemade wooden mallet (keep) requirement instead

- added recipe for training maintenance (no surface needed)

- added recipe to create beginner and advanced maintenance study notes (skill books for maintenance)

- added recipe for bashing flint nodule with stone

- added homemade wooden mallet, works like mallet + hammer (without need of maintenance 1)

- added MasonsTrowel tag to homemade trowel item

- added recipe for carving homemade bucket from log (long process, gives bucket with capacity of 7.0 L)

Homemade recipes no longer require Maintenance level 1.