Make diagnostics features disabled by default

[omix]

An application should by default run with highest performance possible. There are certain diagnostics in QtJambi enabled by default diminishing performance:

• Thread affinity checks (event-driven or method calls)
• dangling pointer check (see #150 )

These features should be disabled by default and to be enabled by runtime property. By this, the feature is explicitely enabled by the developer during app development and testing and disabled for normal use cases.

[omix]

This feature will be available in QtJambi 6.5.1.

From there on use the following runtime properties:

• -Dio.qt.enable-method-logs=true to activate method logging
• -Dio.qt.enable-dangling-pointer-check=true to activate dangling pointer checks (see #150)
• -Dio.qt.enable-thread-affinity-check=true to activate thread affinity checks when calling certain thread-affine methods
• -Dio.qt.enable-event-thread-affinity-check=true to activate thread affinity checks during event handling
• -Dio.qt.enable-concurrent-container-modification-check=true to activate concurrent modification checks during container iteration (see #153).