Deterministic transport references

[loreanvictor]

Transport references are generated randomly, which results in generated files being different every time they are built even if the actual DOM does not have any changes. A better option would be to somehow make the transport references deterministic while maintaining their uniqueness across the DOM tree.

The main difficulty of that is situations where a compiled HTML snippet is used across multiple HTML files. In that situation the transport references within the re-used snippet should not collide with transport references within the host HTML.

Potential solutions:

• default to a super-deterministic transport ref generator like a counter, then allow for namespacing, either via the StaticRenderer, via Context object, etc. the problem is that this is not a fix, but rather opening up API surface and allowing users to implement context-based fixes (it is notable that this is also what JSS does and it doesn't look that bad over there).
• use document.currentScript to avoid needing a transport reference to begin with. the problem is that then we would be unable to support IE anymore.

The original discussion on this matter happened in this issue.

[loreanvictor]

I personally would wait a year until IE usage dies off, and then switch to document.currentScript. We could potentially even decide to drop IE support sooner as well.