v1.2.2

Bugfix release.

I added a universal binary built at the same tag as v1.2.2 a few months after the original release. I didn't want to overwrite the existing demumble-mac.zip. Future releases will have the universal binary in demumble-mac.zip.

The Linux binary is now built with a Debian Sid sysroot, instead of a Debian Jessie sysroot as before.

• [itanium] can now demangle symbols containing $ such as _ZZ3fooiENK3$_0clEi
• [itanium] support C++20 char8_t
• [itanium] support for C++20 lambda expression extensions
• [itanium] fix demangling of enums with negative values
• [itanium] support for this expressions such as _ZN1A1gIiEEDTcldtptfpT1b1fIT_EEEv
• [ms] demangle rtti descriptor names such as .?AVNet@@ if passed as arg (but not when filtering)