Added Dart and Flutter snippets.#35

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Davoodeh wants to merge 3 commits intodoomemacs:masterfrom

Davoodeh:dart-mode

Commits on Mar 21, 2020

Added Dart and Flutter snippets.
Davoodeh
committed

Commits on Mar 23, 2020

Renamed classes.
Davoodeh
committed

Commits on Mar 24, 2020

Moved everything to ./Dart-Mode for simplicity.
Davoodeh
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