ParseFree function

Anything within quotes will not be counted towards input
Animation Bug fix

Views no longer hang when the change frequency is high
Fixed bug with Clear command feedback.
Morning bug fixing

fixed bug with parser when date was valid if endDate>startDate
Merge remote-tracking branch 'origin/jiashun' into jiashun

Conflicts:
	src/parser/InputParser.java
stupid git stuff
Added sort by alpha
Fixed bug in parser

Dates are no longer valid if endDate > startDate
Added sort by position
Merge remote-tracking branch 'origin/jiashun'

Conflicts:
	src/parser/InputParser.java
BUGS LIFE
MOAR BUGS

LOL
1.modified the modeltask class to add in the deadline attributes
2.modified sort method in logic. in specific, the sort by date method
3.added comparator for sorting by date

now program can sort by date
Merge remote-tracking branch 'origin/yongkai'
Merge remote-tracking branch 'origin/krystal'

Conflicts:
	src/gui/view/RootLayout.fxml
Added functionality to menubar. Allow user to change themes from menubar.
Changed edit menu to themes menu.
Added ThemeMenuHandler to handle selection changing.