Pocket Server(For MCPE)

Sep 9, 2017

* You can get new java libraries from Settings->Download Binaries,I just added x86_64 java library today(not tested),please email me whatever it works fine or not!

Fix jenkins cache problem
Add much more check,so you can't start server without required files.
Add MUST READ dialog(tired).
Add "Auto Mount Java Library" opinion.
Add a link to download server binaries.
Fix some crashes and ANRs.