#737 Gradle task doesn't declare all inputs

[Trejkaz]

Reproduction:

• Set up a Gradle build using ProGuard
• Run the proguard task - it obfuscates the jar
• Edit proguard.conf
• Run the proguard task again

Expected behaviour: it obfuscates the jar again
Actual behaviour: it thinks it's up to date and skips executing

The cause presumably is that many public getters in ProGuardTask are not declared as @Input, which is how Gradle figures out whether something is an input. Anything which could change the outcome of the task should be annotated as such to get correct behaviour.

[Trejkaz]

Some methods are also missing output declarations. Example, these two should both be @OutputFile:

• printconfiguration
• printmapping