OTC-244: Successfully uploaded claims are not saved in the folder IMIS/Accepted claims

[sniedzielski]

TICKET: https://openimis.atlassian.net/browse/OTC-244

This ticket also include some changes related to Andoid 10/11 comaptibility (this ticket is linked to OP-315 - https://openimis.atlassian.net/browse/OP-315)

Changes:

• remove "CaptureActivity" installed locally from this project.
• Loaded "CaptureActivity" zxing library using 'implementation' (from external source)
• Changed the build.gradle to target and compile against API level 30
• Moved all acces to "/IMIS/" from Environment.getExternalStorageDirectory().getAbsolutePath() to Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), effectively moving IMIS directory from External Storage root to Documents.
• Added MANAGE_EXTERNAL_STORAGE permission (Android 11)
• Added IMIS main directory name dependent on build variant
• Added saving either accepted or rejected Claims to folder "Accepted" or "Rejected" in IMIS folder