Gets all plugin entries in build.plugins, build.pluginManagement.plugins, profile.build.plugins, reporting and
profile.reporting in this project and all parents
Helper method to check if the given family is in the following list:
dos
mac
netware
os/2
tandem
unix
windows
win9x
z/os
os/400
Note: '!' is allowed at the beginning of the string and still considered valid.