custom rustc lints

How to run

first need to install binary form source code:

cargo install --path .

and then in rust project directory you want to analyze

mac/linux:

RUSTC=lints cargo check

windows:

set RUSTC=lints
cargo check
set RUSTC=

road map

• add f32 cast to f64 precession lost lint(check f32 cast to f64 and warn precession lost(clippy::pedantic has f64 as f32 checking))
• add ui_test similar to dylint::ui_test or rustc/clippy ui_test