[d3d9] Add a forceModeHeights config option

[WinterSnowfall]

The emperor's new clothes, based off of #3615, with the following distinctions:

• naming
• it adds only the config option, no defaults for any game in particular
• forced mode heights parsing happens during adapter creation

This is needed with certain hardware combinations of monitors/GPUs that report an excessive amount of modes, as some games have troubles starting in such situations. In particular the Aquanox series of games are a pain in this regard.