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My attempt to include more Jest globals. Sharing to get early feedback though I need to take a break from this for now to focus on other things.

fakeTimers.test.js has two tests failing right now because I think some tests are improperly leaking changed globals between tests.

But I think this PR gets Jest's fn() mocking function and fake timers API working!

"build": "microbundle --target node -f cjs --no-compress src/index.js src/cli.js src/appender.js",
"build": "npm run build:node && npm run build:web",
"build:node": "microbundle --target node -f cjs --no-compress src/index.js src/cli.js src/appender.js",
"build:web": "microbundle -f iife --no-compress --external none --alias jest-message-util=C:\\code\\github\\developit\\karmatic\\src\\lib\\jest\\messageUtilFake.js --define process.env.NODE_ENV=production -i src/lib/jest-globals.js -o dist/lib/jest-globals.js",
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I'm bundling jest-globals.js separately at build time to avoid our users having to re-bundle all the jest stuff on each run of karmatic. Probably need to move some of these deps into devDeps since they are bundled. Or maybe move them to bundledDeps?

Also need to figure out/fix how to specify aliases in microbundle so that it doesn't require absolute paths

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