CSFML 2.5.2

After a lot of hours put into getting the NuGet package for CSFML to work with SFML.Net on macOS, we've finally achieved it and CSFML 2.5.2 is ready for release! It again contains a lot of important bugfixes.

• Make sure CallbackStream doesn't get destroyed before the Music (#163) by @crumblingstatue
• Slight modernization on the CMake build system (#170, #172, #184) by @brightprogrammer & @ChrisThrasher
• Add missing functions (#148) by @Luhrel
  • sfShader_createFromX
  • sfContext_isExtensionAvailable
  • sfTextureCoordinateType with sfTexture_bind
  • _drawVertexBufferWithIndex to _drawVertexBufferRange & Implements sfRender[Window/Texture]_drawVertexBufferWithIndex
  • sfContext_getFunction
• Added functions for creating sRGB enabled textures from file / memory (#177) by @EnokViking
• Fix matrix comparison in sfTransform_equal (#181) by @Bqleine
• Add function for default RenderState (#178) by @Bqleine
• Add support for macOS (#185) by @eXpl0it3r

Thank you to everyone who contributed!