Add future support for side by side 'page columns' in HD OSD INAV font for Walksnail and WTFOS.

[shannonbaker]

Walksnail introduced support for side by side stacked pages for font files in recent FW. WTFOS in the next version of MSP-OSD will change font format to png and side by side pages within font files. This will align both WTFOS and Walksnail font formats to be the same. To future proof INAV-X-Plane-HITL, side by side page support should be added. Example below/attached.