jSerialComm v2.9.1

• Remove Java-side class synchronization
• Move global resource locks to native code
• Only lock code sections which alter globally shared resources
• Try to interrupt Java thread if it does not join after timeout
• Ensure that event listener does not join on itself
• Do not block-drain serial ports on native close() in Posix
• Update getCommPorts() documentation about returning all currently open ports
• Update getLastErrorLocation() documentation to remove instructions that port must remain open
• Do not block SIGTERM from arriving at Java application
• Update openPort() documentation about BT failures/retries
• Break out of event listening thread if global app is shutting down
• Do not use pthread_condattr_setclock on Android
• Use minimum amount of JNI memory necessary to enumerate Windows ports
• Move library init/uninit functionality into JNI_OnLoad and JNI_OnUnload
• Add method to allow users to add application shutdown hooks for custom serial port cleanup