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Without 'wayland/surface-actor: Reset and sync subsurface state when resetting' this test would fail. This also adds a simple framework for testing lower level Wayland semantics. In contrast to the test-client and test-driver framework, which uses gtk and tests mostly window management related things, this framework is aimed to run Wayland clients made to test a particular protocol flow, thus will likely consist of manual lower level Wayland mechanics. A private protocol is added in order to help out clients do things they cannot do by themself. The protocol currently only consists of a request meant to be used for getting a callback when the actor of a given surface is eventually destroyed. This is different from the wl_surface being destroyed due to window destroy animations taking an arbitrary amount of time. It'll be used by the first test added in the next commit. !961
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