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feat(semester-process-elegible-volunteer): add scope that gets volunteers wit a assignment or group assignment that has started, ever

feat(semester-process-elegible-volunteer): add scope that returns volunteers that dont have a semester process for given semester

Resolve "Refactoring Halfyear Feedback"

Closes #448

See merge request !816

test(mission_either_one_relation_concern): add tests for semester_feedback and semester_process_mission implementation of the concern

feat(semester_process): add the duplication of the mission relation logic and validation into a concern

- call it mission

fix: remove autoprefixer again temporarily due to unavialability of node??! and miniracer block because of panter-rails-deploy

Resolve "Neue Top Menu Punkt Halbjahresfeedback"

Closes #447

See merge request !815

Switch Gilab-CI image and the Gitlab-CI config

See merge request !818

fix(autoprefixer): get back autoprefixer by using Node as execjs env

See merge request !817

Fixes/solve list responses verify buttons redirect problem

See merge request !814

- it doesn't reload the page
- it shows model save errors as list
- it renders json response from the xhr action to template passed to api_button
  - using lodash tmplate

Merge branch 'features/list_responses_has_journal_create_link_with_citation_of_feedback_in_journal_entry' into 'develop'

Features/list responses has journal create link with citation of feedback in journal entry

See merge request !813