[BIP Proposal] Removal of BIP 125 RBF signalling in wallet transactions

The wallet software's functionality concerning transaction replacements was highlighted, particularly when dealing with the signaling bit stored in a local database. It is designed to permit users to replace transactions through (full) RBF (Replace-By-Fee), even if the signaling bit is absent, though it accompanies a warning for clarity and safety. This feature ensures that users are informed about potential risks when attempting to replace a transaction on multiple devices using the same wallet or seed.

This approach is particularly useful as it accommodates transactions from legacy wallets that might not support BIP125 signaling. By default, the software provides a straightforward, safe path for transaction replacements while reserving the more complex, potentially hazardous "forced" replacement option as an expert feature. This strategy helps in avoiding complications or possible loss of funds that could arise from uninformed transaction replacements across different devices. The design aims to balance user-friendliness with the technical complexities of managing blockchain transactions securely.