Xfce 4.12+ Booster Pack for Xubuntu 16.04

Latest stable & semi-rolling packages built focus support for Xubuntu 16.04 
or any Ubuntu 16.04 custom build with Xfce-4.12 & above versions.

- There're also some xfce 4.13.0 transitional packages in this repository.
- It'd be annoying to add too much PPA this was built for gathered many packages all at once.
- Some packages have same version but have better bug fixed.