Move the CommandLauncher interface into the impl package


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270817 13f79535-47bb-0310-9956-ffa450edef68

- Fix duplicate/unecessary imports
- Fix single if/else and loop without block


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270813 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270795 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270689 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270688 13f79535-47bb-0310-9956-ffa450edef68

native execution
environment loading
os detection

into a new hierarchy aut.

AUT basically being completely independent of Ant.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270681 13f79535-47bb-0310-9956-ffa450edef68