Remove JSON stuff

The JSON library I was using was causing issues. I doubt anyone actually uses the whole JSON feature so I just removed it. If you actually use it please let me know and I'll probably build a better system.

UI improvements

• auto-check for updates
• fixed number of PhysBones incorrectly showing 0
• change PhysBones editor output
• automatically inspect after build avatar

Remove PhysBones

• select all materials button
• toggle PhysBones
• dry run cleans up created avatar
• show success message

Build inspector

• fixed materials not being packaged
• do not include duplicates in imported asset output and total
• sort imported assets by filesize
• build button
• fix not including hidden objects

Show imported assets

Added a button to toggle a list showing you all of your imported assets.

1.1.0

• remove all PhysBones action

1.0.0

• new action: remove PhysBone
• replace JSON operations with Newtonsoft
• more visible errors
• hide errors on save actions
• added "show" button to paths
• fix font color
• re-order steps