tetra

Fixes:

• fixed trim names not showing up properly in item tooltips
• fixed machetes being overly weak when breaking blocks tagged as swordVeryEfficient or swordInstamine
• fixed rounding issue for attributes, caused stat diffs to show up when there were none
• fixed stray pixel in crude shortblade

Technical changes:

• made it possible to add/override item tooltip stats
• added ignoreBase and ignoreBonuses fields to attribute_addition stat getter
• added ignoreBonuses to attibute_multiply stat getter
• changed to only load shield model geometry from the tetra namespace