* allow to copy QR data and to read QR data from clipboard
* add share option
* allow to scan QR from gallery
* use menu_copy_to_clipboard instead of menu_copy_link_to_clipboard
* use AttachmentManager
* reuse Bitmap
* change REQUEST_CODE_IMAGE value
* use getCacheDir()
* replace handleOpenPgp4Fpr with handleQrData
* show error message if scanning QR failed
* use Log.e() instead of Log.w()
* Revert "use getCacheDir()"
This reverts commit 2a2a801b311e7c4929f5063d3340234413528b93.
the impact of this change is eaasily larger than expected,
see comments at https://github.com/deltachat/deltachat-android/pull/2103
if needed, we can discuss and re-add that in a separate, more focused pr.
Co-authored-by: B. Petersen <r10s@b44t.com>
Asiel Díaz Benítez