Use byte literals
Move pool mod into the conn mod
Make `MyPool::query` and `MyPool::prepare` public
Add `MyPooledConn::unwrap`
Fix some visibility issues
Move `MyResult` to error.rs
Add `consts::ColumnType` enum
Add `consts::StatusFlag` enum
Add `consts::CapabilityFlag` enum
Add `consts::Command` enum
Add `consts::ColumnFlag` enum
Add `error::ServerError` enum