implemented AsciiStlWriter
implemented AsciiStlWriter.WriteFile
Merge branch 'feature/AsciiStlWriter' into develop
Implemented BinaryStlWriter
added nuget package support
adjusted nupkg build
removed optimization in GenericStl Release builds
as this caused problems with ApprovalTests
removed obsolete references
fixed some code analysis issues
Refactored all reader and writers
added symmetric tests
added custom data structures for better equality handling
added Read/WriteFromStream functions