Types changes have been done. Ensured not to repeat past mistake. Had some issues in changing LockTime types but within the functions they were ultimately being converted to u16 for arithmetic, hence didn't change them as they didn't affect the overall abstraction.

Types changes have been done. Ensured not to repeat past mistake. Had some issues in changing LockTime types but within the functions they were ultimately being converted to u16 for arithmetic, hence didn't change them as they didn't affect the overall abstraction. #1132