LDC 1.6.0

[kinke]

Hi everyone,

on behalf of the LDC team, I'm glad to announce LDC 1.6. The 
highlights of this version in a nutshell:

* Based on D 2.076.1.
* Experimental support for dynamic codegen at runtime ('manual 
JIT').
* Many std.math functions are now CTFE-able.

Full release log and downloads: 
https://github.com/ldc-developers/ldc/releases/tag/v1.6.0

Thanks to all contributors!

[LDC master is at v2.077.1.]