Sophisticated Backpacks

Added slot memory in backpack settings
- allows setting which slots should memorize their contents
- and then only stacks matching the contents are allowed into those slots
Added particles (and sound) that show when smelting upgrades are working
Added particles to jukebox upgrade that show when disc is playing

Fixed calculation of player's total experience in Xp Pump which fixes odd issues like being able to pull more experience after enchanting than what's visible in the experience bar
Fixes click into backpack feature by handling event it depends on with higher priority before other mods get a chance to cancel it (mouse tweaks)
Fixed inventory tooltip to properly set its height so that it doesn't display an extra empty line under certain conditions