Add animations to major components

[aidanhorton]

With all of the applications I use that feel really responsive and good to use, the main differentiator I find is transitions (as long as the UI looks good in the first place, which ours most definitely does!).
I don't think transitions are that hard to do in WPF, all the code I believe could be done in XAML.

Suggested transitions/animations:

• Main open/close of software -> maybe a sweep up, sweep down?
• Sub-buttons expanding -> sweep right?
• Main toggle button -> Smooth transition for the button icon itself, maybe a morph?
• Task description open -> sweep up, sweep down?
• Item type dropdown -> this one is already quite good, but potentially slow it down slightly, or make it do a full swipe down?
• Adding or removing a column -> sweep/fade?

[aidanhorton]

Duplicate: #50