Fix license headers

Signed-off-by: Steven Downer <grinch@outlook.com>
Update build.gradle

Signed-off-by: Steven Downer <grinch@outlook.com>
Update README.md

Signed-off-by: Steven Downer <grinch@outlook.com>
Fix SpoutcraftSimpleButton from not rendering

Signed-off-by: Steven Downer <grinch@outlook.com>