Auto-close: fix settings window minimum size

If you have only one auto-close plugin enabled, settings window becomes
very small because of using sroll window.
Auto-close: Steal plugin data to free it manually
Auto-close: Use G_STMT macro for defines
Auto-close: Remove broken macro because it was fixed in Geany
Auto-close: fix style
Revert "Auto-close: fix possible crash at exit"

This reverts commit 4c4bcb5c2fa498b5f0bcefa20822dd252c4c0c8f.

Conflicts:
	autoclose/src/autoclose.c
Auto-close: bump version because of changing Geany API version