Complete rewrite

• Complete rewrite of the code.
• Full automated test coverage.
• Project is open sourced.
• Information icon popup for the brief information about each action type and functions.
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• bg-inject and cs-inject can use async/await(#25).
  • sendInstruction() and sendBgInstruction = false; are deprecated.
• Made action recording more reliable.
• Rename submit-click to click-update (#46)
• Changed copy action to copy text content of the element and moved "old" copy action into copy-html to copy html content(#20)
• Bunch of bug fixes.