Kconfig (#432)

* 内核编译配置

* 将kernel.config的解析代码搬入crate

* 将设置feature函数放入CargoHandler中

kernel/.gitignore

@@ -1,6 +1,7 @@
 target/
 src/kernel
 Cargo.lock
+D.config
 
 # 将自动生成的C-Rust FFI加到gitignore
 src/include/bindings/bindings.rs

kernel/Cargo.toml

@@ -64,4 +64,4 @@ debug = true   # Controls whether the compiler passes `-g`
 
 # The release profile, used for `cargo build --release`
 [profile.release]
-debug = false
+debug = false