Player: Fix dependency deployment & add instructions

[xeruf]

No description provided.

[SKoschnicke]

Build fails for me:

Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=on -Dswing.aatext=true

> Configure project :
Current version: 21.2.1 Game: blokus_2021 (Java version: 11)
Java version 1.8 is recommended - expect issues with generating documentation (consider using '-x doc' if you don't care)

> Task :plugin:test
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=on -Dswing.aatext=true

sc.plugin2021.PieceTest > Pieces when > sc.plugin2021.PieceTest.serialised should > sc.plugin2021.PieceTest.convert to proper xml FAILED
    java.lang.AssertionError at PieceTest.kt:62
        Caused by: java.lang.AssertionError at PieceTest.kt:62
            Caused by: org.opentest4j.AssertionFailedError at PieceTest.kt:84

sc.plugin2021.PieceTest > Pieces when > sc.plugin2021.PieceTest.serialised should FAILED

sc.plugin2021.PieceTest > Pieces when FAILED

100 tests completed, 3 failed

> Task :plugin:test FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':plugin:test'.
> A build operation failed.
      Could not write XML test results for sc.plugin2021.PieceTest to file /home/sven/development/sc/backend/plugin/build/test-results/test/TEST-sc.plugin2021.PieceTest.xml.
   > Could not write XML test results for sc.plugin2021.PieceTest to file /home/sven/development/sc/backend/plugin/build/test-results/test/TEST-sc.plugin2021.PieceTest.xml.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.8/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 21s
16 actionable tasks: 16 executed

Am I doing something wrong?

[SKoschnicke]

Suggested change

	In diesem Packet ist alles dabei, was du brauchst, um einen Spieler für die
	In diesem Paket ist alles dabei, was du brauchst, um einen Spieler für die

[SKoschnicke]

a gradle clean resolves the "could not write XML" issues.