Nestor's Breakable Bedrock

Changes:
-made the primed echo bomb flash transparent, flashing faster as the countdown gets closer to 4 seconds.
-slightly lowered the bounding box of the primed echo bomb, hopefully this fixes the lack of gravity.
-changed the tooltip for the bedrock greatsword, since it's been retconned.
-made the bedrock greatsword slightly slower. it just makes sense.
-made mobs spawn on fake bedrock 25% less.

Added:
-golden bedrock blocksets, for both fake and real bedrock.
-gilded bedrock versions of the bedrock blocks. all* of them... why do i do these things to myself? (*the exceptions being redrock, badrock, and shattered bedrock.)
-added textures for a bedrock toolset. not sure how i want to go about that, but we'll figure it out by 1.0.4, i guess.
-added creative tabs for the blocks because i was sick of scrolling the building blocks tab. To clarify, they are still in the old tabs, they're just also in the new tabs.
-added the bedrock upgrade smithing template. will have a use by 1.0.4, currently it just dupes Netherite Smithing Templates.

Fixes
-the fake polished bedrock wall now no longer says "fake" in the name, to match the other fake bedrock blocks. whoops!