Fix reliable buffer issue for networking and duplicating

[vlazed]

So far, Stop Motion Helper uses the old net library to send keyframe data over. This is satisfiable for animations for approximately N keyframes (experientially, I found that N is 1000 keyframes). Any higher, and we start overflowing the reliable buffer.

Similarly, attempting to copy or paste entities with animation data results in a reliable buffer overflow.

Ways to overflow the reliable buffer in Stop Motion Helper:

• Select an entity with at least N frames
• Copy an entity with animation data
• Paste an entity with animation data

This issue shall report solutions to keep the data usage under the reliable buffer bandwidth

Potential Solutions

• Overhaul some keyframe networking with netstream-like solution
• Add guards for copying and pasting animation data. This is useful if you want to ensure that a player doesn't crash from duplicating a potentially malicious dupe from the workshop