Store window position in Preferences rather than static variable so that it persists through program invocations

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14092 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Createt wait dialog for plugin loading since this now make take an enormouse amount of time.  Also moved some time consumin steps forward, so that they happen during progarm start up, which matches user expectation better

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14093 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd