* Removed the Interfaces folder.
* All objects inside the GameObjects subfolders are now in the GameObjects namespace.
* Added a Resharper DotSettings file to mark the GameObjects subfolders as not providing namespaces.
* Simplified Robust.client.Graphics namespace.
* Automated remove redundant using statements.
* Attempted Clyde cleanup, didn't get far.
* Add negation operator to Vector2i.
* Add RenderOrder to ISpriteComponent.
* Post process shaders.
Adds "post process" shaders to sprite component.
These are executed on the WHOLE sprite component (every layer)
in one draw.
This is necessary to implement functional outlines.
* Project file refactor
Move all the .csproj files to the new .NET Core style.
This doesn't make any difference for compiling for Framework,
but it does reduce a ton of useless boilerplate.
As an extension of this, killed a bunch of uncompiled & unmaintained .cs files.
Compiling for release (to profile) works now.
Removed AnyCPU targets from the solution file.
* Fix compiler warnings.
