Add CaptionTextBox.SetTextBackgroundColour

Sets the background colour of the given text.
Add Location Radio Buttons

Adds a GroupBox containing screen locations for Captions.
Add Emotion and Intensity Controls

Adds RadioButtions and GroupBoxes for Emotion type and intensity.
Renames LocationGroupBox to GB_Location.
Add Alignment Buttons

Adds alignment buttons to mainform. Moves around some controls and
adjusts their sizes.
Add MarkupController.cs

Adds MarkupController, a class for controlling the markup of captions.
Add InitMarkupController to MainForm
Add LoadCaption and ClearCaption Methods

Adds the LoadCaption and ClearCaption methods to Markup Controller.
Replaces previous functionality int CaptionView_SelectionChanged with
the new methods.
Add Click Listeners to Caption Markup Controls

Also adds Change methods to MarkupController, however two of them still
have to be implemented.