Allow dynamic setting of publicpath, fix language loading error in pat-calendar.

[thet]

• Allow overriding the public path from outside via the definition of a window.__patternslib_public_path__ global variable.

Plus other fixes:

• pat calendar: Fix language loading error "Error: Cannot find module './en.js'"
• pat depends, pat auto suggest: Fix a problem with initialization of pat-auto-suggest which occurred after the lazy loading changes.
• Cleanup

Lazyloading external modules:

• https://github.com/quaive/ploneintranet/pull/3617
• https://github.com/quaive/quaive.resources.ploneintranet/pull/44
• https://github.com/quaive/ploneintranet.prototype/pull/1085
• Allow dynamic setting of publicpath, fix language loading error in pat-calendar. #759

Already merged:

• Implement lazy loading of external libraries #758