[cecilia] Simplify the <configuration> of the maven-ceciliaadl-plugin
To simplify the build of Cecilia apps with Maven some <configuration> parameters are not necessary or strictly demanded.
For example demanding to configure the "src-path" to point to the ${project.build.dir}/cecilia-dependencies is a "legacy" need (before Matthieu did the maven-cecilia-plugin and maven-car-plugin to handle unpacking of cecilia sources in that chosen directory).
A possibility is to by default add that src-path automatically during the execution of the maven-ceciliaadl-plugin.
Another parameter that could be replaced with a default value is the "exec-name", which could be defined automatically during the execution of the maven-ceciliaadl-plugin as (to choose) one of the things that seems to me the most indicative to choose the target executable name:
- the name of the project being built (=> the value of <artifactId>)
- the name of the ADL file being compiled (=> the value of <adl>)
- a simple "main" file name.
The "exec-name" could of course be overriden by configuring it explicitly in the <configuration> of the maven-ceciliaadl-plugin.