LDC 1.25.0-beta1

[kinke]

Glad to announce the first beta for LDC 1.25 - some highlights:

- Based on D 2.095.0+.
- LLVM for prebuilt packages bumped to v11.0.1.
- Profile/trace LDC invocations via --ftime-trace.
- New Windows installer.
- New experimental template emission scheme for 
-linkonce-templates. This option can significantly accelerate 
compilation times for optimized builds (e.g., 56% faster on my 
box when compiling the optimized Phobos unittests).

Full release log and downloads: 
https://github.com/ldc-developers/ldc/releases/tag/v1.25.0-beta1

Please help test, and thanks to all contributors & sponsors!