- support depends, conflicts and provides nodes, all under a 'dep' node
- autoload are kept for now and are not moved yet
- modules are updated for new dep format
- it is now required that module's name and filename are the same
Fixed the velocity messages (using the correct variables)
Works for PX4FLOW mounted as described here: https://pixhawk.org/modules/px4flow
Option to use i2c or UART to get data from PX4FLOW
Sends debug messages (maybe make optional if needed).
Start working on #940
This replaces
```xml
<depend require="foo|bar" conflict="baz"/>
```
with
```xml
<depends>foo,bar</depends>
<conflicts>baz</conflicts>
```
and now allows to specify OR dependencies with | (pipe) similaro to Debian depends:
```xml
<depends>foo,bar,this|that</depends>
```
which would depend on: foo AND bar AND (this OR that)
Gautier Hattenberger
Michal Podhradsky
Michal Podhradsky
Felix Ruess