Added optional padding to video frames because that's what VideoPlayerWidget expects.
Keeping the option to not use padding for other use-cases like converting frames to PNG.
Removed property backing fields where applicable, introduced C#7 syntax for properties.
Renamed a bunch of interface properties and class private members with more descriptive names.
Did some inconsequential reordering.
- Fixed a rounding issue in `WavReader.WaveLength()`.
- Fixed `AudReader.SoundLength()` not resetting the stream position.
- Fixed crashes caused by disposed streams because `LengthInSeconds` would try and calculate the length on the fly. It is now precalculated and cached (making it consistent across all 5 current `ISoundFormat` implementations).
- Fixed a crash in `AudReader.LoadSound()`'s `out Func<Stream> result` because that func would try and access the disposed stream's `Length` property. That works for `SegmentStream`, but not for `FileStream`.
- Fixed frameCount/soundLength label positioning in the AssetBrowser window to avoid text clipping .
Splitting them from one array into separate allows us to then reliably pick how each asset should be presented. Also lets us unhardcode some checks like "if file is .vxl ... else is sprite".
Each successive value of BlockedByActor is a superset of the previous value. Having a mixed up order of values in PathSearchOrder is not useful.
In the previous ordering, if a search for Immovable failed to find a path, it would then attempt Stationary. However Stationary is *more* restrictive then Immovable. If Immovable failed, there is no way Stationary could succeed. This means the search for Stationary is wasted effort.
In the fixed ordering, we try Stationary first. In the fixed ordering there are no pointless searches. Every search might succeed where the previous one failed and is therefore useful to try.
