Implement pending transaction cancellation in the TUI app

[philipr-za]

Description

This PR implements the ability to cancel a pending transaction from the TUI app. If you have pending transactions you can select a transaction and hit C to cancel it. The PR also adds in Confirmation dialogs to the TUI app and implements from the tx cancellation, transaction sending and contact deletion.

This PR also fixes a bug in the WindowedListState logic where if an item in a list was deleted while the last element was selected it broke the List State.

How Has This Been Tested?

Test provided for WindowListState bug and manually tested app.

Types of changes

• 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'm merging against the development branch.
• I ran cargo-fmt --all before pushing.
• I ran cargo test successfully before submitting my PR.
• I have squashed my commits into a single commit.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.