Work in progress: webpack

[rhansen]

Still far from complete. Progress:

• [x] bundle pad code
• [x] bundle plugin code
• [x] file name based on content hash (for cache friendliness)
• [x] source map
• [ ] bundle frontend tests
• [ ] watch for changes when not in production mode (to facilitate development)
• [ ] figure out migration plan for plugins that do dynamic require() (are there any?)
• [ ] bundle timeslider code
• [ ] bundle inner frame code
• [ ] put vendor code in a separate chunk
• [ ] put shared code (pad, timeslider, inner) in separate chunks
• [ ] split cleanups off into their own commits
• [ ] figure out better way to handle adoptPluginsFromAncestorsOf() (can it be removed?)

For future PRs:

• [ ] babel
• [ ] bundle CSS

Fixes #4820

cc @webzwo0i

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.