SyndiBox v1.5.3-r2

Recent changes (1.5.3):

• Removed unsupported static typing for signals (@AlexFlasch)
• Cleaned up tag checking (@henlo-birb)
• Added customizable manual advance action (@henlo-birb)

Hotfixes (1.5.3-r2)

• Fixed indentation issue (@henlo-birb)

Big thank you to all contributors for 1.5.x so far, you've all been a huge help! <3