[MU3] fix #296528: Footers now appear inside page margins

[SKefalidis]

Resolves: https://musescore.org/en/node/296528

Added the ability to layout a textbase using the bottom margin (the old way used the top margin in every case). This change fixes the issue.

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[dmitrio95]

As mentioned also in the issue, this seems to effectively reverse the change made in #4944, although the implementation seems to be different.

[SKefalidis]

Updated and rebased. Added the option of how to draw the footers as a style.

[Jojo-Schmitz]

Adds one string to the translations. Not an issue, just noting...

[RobFog]

@dmitrio95 What do you think makes more sense?

[dmitrio95]

Well, I am not that sure what makes more sense. The change made by this PR makes both footers and headers lie outside of the margins area which is indeed more consistent than the situation we have now. In this regard I think this change makes sense.

As this PR introduces a new style setting, footerInsideMargins, it may also make sense for compatibility reasons to set it to true when importing 2.X and perhaps older 3.X scores (this seems to be determined now by the files in share/styles). Otherwise this change, while fixing the inconsistent default settings for newer scores, also effectively returns this issue back.

[Jojo-Schmitz]

I can't see any effect when toggling that option "Inside margins", it still stays outside the page margins?

Seems 2.x has it outside the margins, (2.3.2 at least). 3.5.2 too (and I have no older 3.x handy to test), so no need to tweak the style files.

[Jojo-Schmitz]

I take it all back, I just accidentally left out one line of you PR, and of course (Murphy's Law) the vital one from textbase.cpp...
It does seem to place it way too high though?

Still no style default change needed for any prior version as far as I can tell. Or would this be needed only needed for 3.0?

[RomanPudashkin]

3.x is closed for any changes