[balsa/oauth2-support] (34 commits) ...Merge remote-tracking branch 'origin/master' into oauth2-support

[Albrecht Dreß <albrecht src gnome org>]

Summary of changes:

  ffb9eb8... Update Polish translation (*)
  abfda88... Update Catalan translation (*)
  3b0bbca... libbalsa/imap: Fix a clang-9 issue (*)
  e086fdb... meson.build: Add -Wenum-conversion flag (*)
  eaa8b28... imap-handle: Do not confuse Imap* enums (*)
  32e4f78... Add .gitlab-ci.yml (*)
  6b4b69b... Merge branch '51-fix-clang-9-fails' into 'master' (*)
  0760a99... fix composer description of forwarded messages (*)
  a32a459... Merge branch 'fix-issue-53' into 'master' (*)
  f4fcbcf... IMAP: fix multipart crypto operations (*)
  da4d141... Autocrypt improvements (*)
  1f48d48... Update Romanian translation (*)
  985ad36... Update Ukrainian translation (*)
  f9c2bb3... Update Serbian translation (*)
  ee6a488... Update Brazilian Portuguese translation (*)
  4b69f74... Port your module from g_memdup() to g_memdup2() (*)
  e376c8f... Update Serbian translation (*)
  b7c7827... Check for GLIB stable version (*)
  a74786c... Merge branch 'master' of gitlab.gnome.org:GNOME/balsa (*)
  025895a... Update Polish translation (*)
  420127f... mailbox-mbox: Ignore Content-Length headers (*)
  f9909de... Update German translation (*)
  ed2006f... Merge branch 'respect-content-length' into 'master' (*)
  dfbccd4... Updated Spanish translation (*)
  34098e5... Update Turkish translation (*)
  e135af0... mailbox-imap: Handle expunged messages in idle (*)
  a947e42... Merge branch '56-imap-expunge' into 'master' (*)
  fb6aab6... mailbox_imap: Discard expunged seqnos on close (*)
  9878ef9... Updated Danish translation (*)
  1e811ea... Update Turkish translation (*)
  26e554a... imap-handle: check for non-compliant responses (*)
  527ac24... mailbox: Lock destination when copying or moving (*)
  8890d2c... Merge branch 'lock-dest-when-copying' into 'master' (*)
  62a5d82... Merge remote-tracking branch 'origin/master' into oauth2-su

(*) This commit already existed in another branch; no separate mail sent