Rewrote content builder targets to support automatic building and packaging of content
fix Intersects(ref BoundingBox box, out bool result)
Merge pull request #3167 from nkast/optimizeBoundingSphere

fix Intersects(ref BoundingBox box, out bool result)
Merge pull request #3138 from SongArc/feature/content_build

Rewrote content builder targets
Update README to point to new Protobuild documentation
Merge pull request #3175 from hach-que/readme-update

Update README to point to new Protobuild documentation
ReplacedTextInputEventArgs and EvenHandler with Action<char> so garbage not created each time
Correct links in project definitions for new Protobuild documentation
Merge pull request #3176 from hach-que/readme-update

Correct links in project definitions for new Protobuild documentation
Ensure pipeline builds successfully on Linux
Merge pull request #3177 from hach-que/protobuild-packages

Ensure MonoGame builds successfully on Linux
Use tabs instead of spaces (as that is what is already used here)
Fix tabbing in TextInputEXT
Merge back from develop