Prevent name clash with Substrate Pallet Template (#2536)

* Remove cumulus template pallet

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

* Use substrate template pallet

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

* Update Cargo.lock

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

* Revert back to master

Revert "Remove cumulus template pallet"

This reverts commit a6d3566e52e9124c0e9823c12cacea557187c6b4.

Revert "Use substrate template pallet"

This reverts commit fbb8eea28dec5b75e13823762572d24bd9a4b88f.

Revert "Update Cargo.lock"

This reverts commit ee24cb81e5d91d6b8f7ef0c97d0f0fdbfe857c53.

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

* pallet-template -> pallet-parachain-template

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

* Update Cargo.lock

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>