[Feature Request] Show used budget in relation to time in month

[rsrmean]

I'd like to propose implementing a little indicator that marks the time in month on top of the used budget view.

Example 1 It is the 10th of November:

The added line indicates that a third of the month has passed, but already 47% of the budget are spent (therefore, the indicator is red).

Example 2 It is the 20th of November:

Because two thirds of the month are over, the inidicator is blue and farther to the right.

This might be helpful for managing budget throughout the month and maybe cutting down on spending.

[dreautall]

Good idea, should not be that hard to implement!