Multiple builds each time

Allow to load a file with several directories separated in different
lines and launch a build for each of those directories.
Refresh status table via listener with the watcher as producer (remove
Swing timer).
Handle GUI threads correctly.
Parameters on build project files

Now parameters for the build can be specified on the project file after
a ; character
Need for packages was real
Add Maven build POJO for use when launching builds

POJO includes command and directory of execution
Change the way project files are defined

Now you need to put all the command except for the mvn part
Create interface class for project files

Add a new class to act like an interface for project files, wrapping
them and returning MvnBuild objects from its data.