transaction duplication

[SerhiiShovkoplias]

Description

fixed transaction duplication
improved gif caching. Now cached gif will be released from memory if memory is overstock
added cell prefetch (tx table view)

Motivation and Context

#594

How Has This Been Tested?

manually

Types of changes

• UI fix (non-breaking change which fixes a UI issue)
• Functionality bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Feature refactor (No new feature or functional changes, but performance or technical debt improvements)
• New Tests
• Documentation

Checklist:

• I have tested this on multiple simulator devices with different screensizes.
• I'm merging against the development branch.
• Commits have been squashed into one commit with a descriptive commit message
• I ran all tests before pushing.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added/changed tests to cover my changes if not UI changes.

[kukabi]

See the comments please.