attrimpl 0.1.0

The crate provides attributes to automatically implement common traits and reduce boilerplate code.
Documentation 
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# Warning
This package is under construction, handle with care!


# attrimpl
The aim of the package is to reduce boilerplate code by adding implementations in trivial cases:
- Traits
  - `Into`
  - `From`
  - `Deref`
  - `DerefMut`
  - `Asref`
  - `AsMut`
- Getter methods


## Todo
* handle errors in the package instead of relying on the Rust compiler where possible
* write a proper readme file with examples
* `#[attrimpl(from)]` has to work with enums
* `#[attrimpl(from)]` should work with multiple field structs and enums. Should be able to set the default values of the other fields (e.g., `#[attrimpl(from(field_default | container_default))]`).
* write test framework for compile time errors
* write a failing test where non-defined directive is given
* implement the following directives
  * `#[attrimpl(convert)]`
    * `#[attrimpl(from)]`
    * `#[attrimpl(into)]`
  * `#[attrimpl(deref_both)]`
    * `#[attrimpl(deref)]`
    * `#[attrimpl(deref_mut)]`
  * `#[access(copy | clone | ref)]`
    * `#[attrimpl(get_ref)]`
    * `#[attrimpl(get_mut)]`
    * `#[attrimpl(get_copy)]`
    * `#[attrimpl(get_clone)]`
  * `#[attrimpl(as)]`
    * `#[attrimpl(as_ref)]`
    * `#[attrimpl(as_mut)]`
  * `#[attrimpl(display("asdasd {}"))]`
  * not sure whether to implement that one: #[attrimpl(borrow)]
  * search for othe possibilities of useful directives