v0.3.0

Changelog

47a15b5 cxgo: convert simple macro const usages to idents
34f6b27 cxgo: convert string constant defines
7a1200c cxgo: fix regression with array indexes
610f147 cxgo: fix regression with builtin macros
e99683c cxgo: handle nested struct initializers
13be078 cxgo: move sdl package to a separate repo
ca96cb3 cxgo: properly convert loops with multiple inits
3bcca12 deps: update cc to v3.31.1
9aa1f6d libs/limits: correctly print large int constants
7597bdb libs/time: support CLOCKS_PER_SEC