Lockdown - Mouselook targeting

tag 6c3a5030db91ac30738f72cf7f644c71cb1d8c3c 1.4-3
Author:    Xuerian <sky.shell@gmail.com>
Date:    Fri Oct 30 23:11:23 2015 -0400

Some fixes

commit 107e772b86edc36d417040c4e0db9d5ced399959
Author: Xuerian <sky.shell@gmail.com>
Date:   Fri Oct 30 23:11:02 2015 -0400

    Be sure to clear invalid player unit

commit 06bb11b9f749cf59c0ecaaa7d49d3b010a84f7ce
Author: Xuerian <sky.shell@gmail.com>
Date:   Fri Oct 30 23:10:42 2015 -0400

    Track current frame instead of tick for invalid target changes

commit 91877aa59904a6a30d1fab1f6d3441ae6f1313e2
Author: Xuerian <sky.shell@gmail.com>
Date:   Fri Oct 30 23:09:49 2015 -0400

    Update units on minimap marker change and death

commit ef0bb28f18f9271a4a62f40db28f3c28aec8aa5b
Author: Xuerian <sky.shell@gmail.com>
Date:   Fri Oct 30 23:09:29 2015 -0400

    Don't target dead standard units