Work in progress: webpack

[rhansen]

Still far from complete. Progress:

• bundle pad code
• bundle plugin code
• file name based on content hash (for cache friendliness)
• 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]

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]

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]

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]

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.