Bug fixes, changed cache management

• Continue uploading images even when the upload fails for an image
• Reuse image cache between app sessions (without logout)
• Changed min/max cache sizes, memory cache management

Bug fixes
• Fixes progress view not showing up when sorting local images before upload
• Fixes "Move album" icon visibility
• Fixes crash occurring when changing cache size w/o admin access

Look at the list of issues closed by this release.