User Experience Update [1.15+]

[+] Glowing effect when editing.
[+] Snapping Control when sneaking.
[+] Actionbar message to tell which part you just modified.
[+] Standalone "Toggle Gravity" option.
[+] Editing pose is now "Cancelable".
[~] Revamp User Control.
[~] Increase the selection area of invisible armor stand so you don't lose it.
[~] Optimized joint lookup algorithm
[~] Optimized pose-angle calculation algorithm.
[~] Moving armor stand is now less laggy.
[~] Properly followed Minecraft Datapacks's Conventions.