cherry-picked 3f9cb70ec733db5: PmBean with enhanced read and cache behavior

Conflicts:
	pm4j-core/src/main/java/org/pm4j/core/pm/impl/PmMatcherBuilder.java
chrerry-pick 5034786c93bc49c: Enhanced PmBeanImpl(2) review changes

Conflicts:
	pm4j-core/src/main/java/org/pm4j/core/pm/impl/BroadcastPmEventProcessor.java