Review and fix/improve PWA behaviour and serviceworker

• Get avoid caching paths from SETTINGS (with merge_app_settings)
• Set avoid caching paths in core
• Set avoid caching paths in all apps

mentioned in issue #141 (closed)

changed the description

assigned to @yuha

added part::backend part::frontend prio::2 type::bug labels

created merge request !336 (merged) to address this issue

mentioned in merge request !336 (merged)

marked the checklist item Get avoid caching paths from SETTINGS (with merge_settings) as completed

marked the checklist item Get avoid caching paths from SETTINGS (with merge_settings) as incomplete

changed the description

marked the checklist item Get avoid caching paths from SETTINGS (with merge_app_settings) as completed

marked the checklist item Set avoid caching paths in core as completed

closed with merge request !336 (merged)

mentioned in commit aee5dbb0