FpDebugger (pure): Use the (thread-safe) log system instead of DebugLn

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45409 4005530d-fff6-0310-9dd1-cebe43e6787f
FpDebugger (console): Use 'Debug' and 'Error' prefixes for dllError and dllDebug messages.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45410 4005530d-fff6-0310-9dd1-cebe43e6787f