Cleanup some files (#1166)

* Remove .cargo folders

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove rustfmt.toml

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Hide rustfmt.toml file

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Merge .gitignore files

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update commit hash after history-rewrite

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Try to hot-fix license scanner

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update .gitignore

Co-authored-by: Chevdor <chevdor@users.noreply.github.com>

* Undo changes to check-license

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Chevdor <chevdor@users.noreply.github.com>