Uniform pallet warnings (#13798)

* Use proc-macro-warning crate

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

* Fixup

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

* Fix pallet_ui tests

Also renamed some of the odd-named ones.

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

* Update dep

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

* Ignore hardcoded weight warning

To be fixed in https://github.com/paritytech/substrate/issues/13813

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

* Fix test pallet

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

* Fix more tests

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: parity-processbot <>