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add attr-acessor for selected, in order to be able to filter form selected volunteers on select in form

Chores/create specs for semester process elegibility scopes

Closes #459

See merge request !824

feat(semester-service): add service that delivers semester date ranges and lists for forms

See merge request !822

fix(volunteer-semester-process-elegible): fix have_semester_process with doing subselect, because it didnt work otherwise

feat(semester-process-elegible-volunteer): add method semester_process_eligible that joins and groups the relevant scopes for semester process volunteers

feat(semester-process-elegible-volunteer): add scope that selects volunteers that where with active assignments or group assignments within the given semester

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