Renaming primary git branch from master -> main

[Sam Clegg]

To match llvm, binaryen, and many other projects that have already made the switch I'm hoping we can transition emscripten fairly soon.

emsdk might be a little more tricky since there are many end users who are using the emsdk directly from git (whereas with emscripten most users use emsdk to get emscripten).  So my plan is to go emscripten first and leave emsdk for later.

Are there any issues we are likely to run into that I might not be aware of?

cheers,

sam

[Sam Clegg]

Issue is https://github.com/emscripten-core/emscripten/issues/13520

[Sam Clegg]

Heads up: this is happening today... assuming nothing goes wrong.  Will reply again is/when it sticks.