Drafted crude implementation of MIS functionality.

(To meet deadline.)
(Miscellaneous) Removed redundant import statements.
(Miscellaneous) Created macros for initializing various JavaFX controls.
Implemented JavaFX control macros where applicable.
(Miscellaneous) Extracted read/write ops into filesystem macros.
(Miscellaneous) Implemented filesystem macros.
(Miscellaneous) Removed tooltip from ListView init.
(Miscellaneous) Created alert modal object.
Extracted MIS functionality to separate object.
Implemented MIS object in MainWindow.
Merge branch 'multipleImageSubtraction'