cob_extern: 0.5.3-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `cob_extern` to `0.5.3-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.10`
- previous version for package: `null`

## cob_extern

```
* Update package.xml
* New maintainer
* Contributors: Florian Weisshardt, ipa-nhg
```

## libntcan

- No changes

## libpcan

```
* merge
* fix install script
* using version 7.9 of libpcan
* Contributors: ipa-fmw, ipa-nhg
```

## libphidgets

```
* Merge pull request #39 <https://github.com/ipa320/cob_extern/issues/39> from ipa-fmw/hydro_dev
  change maintainer
* Update package.xml
* removed unused makefile
* added checksum for new tarball
* updated libphidget version
* Contributors: Florian Weisshardt, Nadia Hammoudeh García, ipa-bnm
```