20160122:
- add: memory manager for less RAM allocations.
- add: display option, use offscreen VDI handle.

20160124:
- fix: gxalloc shrink with negative value.

20250526:
- fix: crash under FalconTOS without NVDI, if image blitting exceeds right border.
- fix: alert for 640x400 screenmode minimum needed (then continue).
- fix: preferences windows is width reduced.
- fix: add "u:" and convert to antislashes for $HOME value written in un*x slashed format.
- chg: use of clean revamped EXIST() instead of old Fopen() trick.
