Minor version bump to v1.52

Minor version bump to 1.51

Fix: Path parsing error for special characters

Replace platform-specific path resolution with unified cross-platform 
approach using libretro-common's fill_pathname_resolve_relative function.

Version bump to 1.48

There's so many big changes and regression fixes from 1.45 that i
personally think it's worth jumping straight ahead to 1.48.

Display: More improvements to setCurrent()

I haven't seen a use to keep calling hideNotify() in setCurrent()
yet, and since it has the potential to break stuff unless worked
around (Harry Potter: Find Scabbers), i'll leave this call as a
comment for the time being. As a result, its surrounding area was
simplified. setCurrent(Alert, Displayable) was also reworked to
function similarly to setCurrent(Displayable), and Alert screens
also received a minor UX tweak (you can now press LEFT_SOFT to
dismiss it, which matches the position of the "OK" option, previously
only FIRE/NUM5 dismissed it).