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This PR reverts #127. An enhanced plugin system is too complex and become to be difficult to implement extended features at inherited class. (marp-team/marp-core#64)
In addition, a main motivation of enhanced plugin system has been lost because a way to extend VS Code's markdown-it had changed in marp-team/marp-vscode#17.
We should keep a simple way to extend Marpit, is the same way as markdown-it plugin.