Add 'logical' measure number to status bar

Posted at the suggestion of Marc Sabatella. See discussion at: https://musescore.org/en/node/90571

In brief, Musescore indicates numerically where in the score the cursor sits at any given moment. This appears in the status bar in two different places: On the left (with fuller info including note pitch, duration, voice, measure, beat, and staff) and on the right (a simple 'chronological' read-out such as 98:02:240 meaning measure, beat, and sub-division). This information can be invaluable to someone doing input for keeping track of where they are while working on two or three different keyboards simultaneously and referring to a paper part or score which may be full of erasures, crossed-out measures, and errors (especially when copying autograph manuscripts or 18th-century editions).

However, both read-outs in the status bar give the 'ABSOLUTE' measure number, and do not take into account (a) 'irregular' pick-up measures which have been set to be excluded from the measure count, or (b) section breaks, which restart the 'logical' measure numbering for subsequent movements of longer works.

As there are TWO read-outs in the status bar, I would like to request that one of them be re-configured to give the 'logical' measure number--the one which will actually appear printed in the score when it is finished. Having the 'absolute' measure number in the other read-out is important for finding one's way back into a score using CTL+F.