Merge pull request #707 from jikuja/fix_linux

Fixed new version checker to work under linux
add in option to give MC some extra optimization arguments on fast computer's in the options pane
Fixes concurrency bugs, cleanup and reorders code

  * Reordered code in LaunchFrame.java to fix concurrency and
    GUI blocking bugs
  * Moved FTBOSSent under dynamic storage
  * Reworked I18N:
     Added function to setup I18N without downloading
     Added function to only download new locales
     Added wait and sleep lock to ensure DL servers are found
  * DownloadUtils:
     Added setName() for thread
     Added log to to debug when thread is started
  * Added comment about concurrency bug in TexturePane.java
utils/AppUtils.java: Added waitForLock()

 * Added two static waitForLock functions which
   implements basic sleep and check locking.
 * Converted old code to use new functions
 * locale/I18N.java: fixed NPE
Fixed AuthlibDLWorker

 * Fixed AuthlibDLWorker's swingworker
 * LaunchFrame: GUI buttons ´made final and added getters
 * Launch button  will be enabled after AuthlibDLWorker
   is executed.
 * Launch button is possible to get enabled if user click other tab and
   returns back  to modpack tab. Minor problem. Did not fix that.
Refactored UpdateChecker to use SwingWorker

 * Will check for updates background in swingworker thread and opens
   LauncherUpdateDialog if needed
Added UnreadNewsWorker.java

 * Swingworker to check unread news and to set icon in news tabs