Added rudimentary text input

Added a textBox and Button to add items to the ItemList via text input.
Syntax:
Commands are executed at the same time if they are seperated by '.' (eg.
D.HP is DN HP).
If a line begins with a '+' it is a Hold item, if it starts with a '-'
it is a Release item.
If a line starts with a 'W' it will interpret the rest of the line as a
int for a wait item (eg. W100 is Wait 100 Frames).

When "Parse Script" is pressed the TimeLine is cleared and the script is
interpreted.
Merge branch 'Scripting-Input'