Mac OS X Launcher - reborn - ALPHA!

TLDR;
Howto? ant osxLauncher
Privacy Notes? If you don't got SBT, a bash script will trigger
               download of SBT for you with task osxLauncher.
Results? open ./launchers/output
"Binary" App Bundle name: I2P.app
Runtime base directory? ~/Library/I2P
Runtime config directory? untouched.

After talk on IRC with zzz, I rewrote the logic since we could
start with a simple deploy, for a faster alpha version ready :)

SBT will build a zip file from the content of pkg-temp, which
CompleteDeployment.scala will again unzip in runtime. Right now
it's quite basic, but the plan is to add version detection, so
it's capable of upgrading a already deployed I2P base directory.

OSXDeployment.scala is renamed to PartialDeployment.scala for usage
in the browser bundle launcher, since it's going to be a subset of
the files found in pkg-temp.

A Info.plist is added to the launchers/macosx which is added to the
application bundle under building. Note that this differ from the one
in Start i2p router.app that's been here for years now.

.mtn-ignore

@@ -59,6 +59,7 @@ launchers/target
 launchers/project/target
 launchers/common/target
 launchers/output
+launchers/project/project
 
 # Reporting
 sloccount.sc