latest working version.

features:

• quarterly roadmap tracking. add and remove quarters as needed
• color coded tasks/features with descriptions
• 4 stages of development (planned, developing, testing, and completed)
• move tasks up and down, and between quarters
• saved in .json format

known issues:

• moving or renaming tasks is slow as it reloads the entire interface each time
• unticking an item removes the color from the completed button but does not return it to "testing" status