rocon_app_platform: 0.7.4-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `rocon_app_platform` to `0.7.4-0`:

- upstream repository: http://github.com/robotics-in-concert/rocon_app_platform
- release repository: https://github.com/yujinrobot-release/rocon_app_platform-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.16`
- previous version for package: `0.7.3-0`

## rocon_app_manager

```
* ignore unncessay remapping rule #265 <https://github.com/robotics-in-concert/rocon_app_platform/issues/265>
* Contributors: Jihoon Lee
```

## rocon_app_platform

- No changes

## rocon_app_utilities

- No changes

## rocon_apps

```
* volume is now configurable
* Contributors: Jihoon Lee
```