Avoid potential conflict.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@14932 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Synchronize methods of generic feature to use for multi threading loading.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@14933 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Adding method to set internal executor.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@14934 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Merge remote-tracking branch 'upstream'