FM-TOWNS: Enable aspect ratio correction

[elvisish]

This was requested 14 years ago but was ultimately rejected: ​https://sourceforge.net/p/scummvm/feature-requests/266/

The FM Townes games are presented at 320x200 and leaves a 40 pixel black gap at the bottom of the screen. The game looks squashed and doesn't match any other SCUMM game that uses Mode 13h and stretches the pixels 20% taller so the aspect ratio is correct.

It was rejected on the grounds that The original games were intended to be squashed, however as a commented mentioned, the original games were never intended to use HQ or SAI filters.

[ZvikaZ]

This feature was implemented and waits for volunteers to test (just play...) in order to send as PR.
See discussion at ​https://forums.scummvm.org/viewtopic.php?p=88663#p88663

TL;DR

git clone https://github.com/ZvikaZ/scummvm
git checkout z_zm_height_200_v7

I'm mainly interested in Loom testing (as it's the most problematic), but reports for bugs (or their absence) for any of the games will be welcomed.