v1.6.0 to fix multiple-definitions linker error

### Releases v1.6.0

1. Fix `multiple-definitions` linker error. Drop `src_cpp` and `src_h` directories
2. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project.
3. Add support to many more boards, such as `SAMD21E1xA`, `SAMD21G1xA` and`SAMD21J1xA`
4. Optimize library code by using `reference-passing` instead of `value-passing`
5. Update all examples
6. Update `Packages_Patches`

Author: khoih-prog

README.md

@@ -1396,6 +1396,8 @@ Many thanks for everyone for bug reporting, new feature suggesting, testing and
     <td align="center"><a href="https://github.com/thiagothimotti"><img src="https://github.com/thiagothimotti.png" width="100px;" alt="thiagothimotti"/><br /><sub><b>thiagothimotti</b></sub></a><br /></td>
     <td align="center"><a href="https://github.com/generationmake"><img src="https://github.com/generationmake.png" width="100px;" alt="generationmake"/><br /><sub><b>generationmake</b></sub></a><br /></td>
     <td align="center"><a href="https://github.com/homeodor"><img src="https://github.com/homeodor.png" width="100px;" alt="homeodor"/><br /><sub><b>Alexander Golovanov</b></sub></a><br /></td>
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+  <tr>  
     <td align="center"><a href="https://github.com/will63powell"><img src="https://github.com/will63powell.png" width="100px;" alt="will63powell"/><br /><sub><b>Will Powell</b></sub></a><br /></td>
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