ProGuard 7.0.0

Issue	Explanation
	Added support for Kotlin metadata, with new option -keepkotlinmetadata.
PGD-32	Allowing Java 14 class files.
	Optimizing away instance references to constructor-less classes.
DGD-1489	Fixed potential IllegalArgumentException with message Value "x" is not a reference value when optimizing code with conditional casts.
PGD-12	Fixed building gradle plugin.