Revert "flipped coordinate system of camera"

This reverts commit 4c4280b142f7189c0f3d4e2553658febbe00211f.
Revert "more graphics use top left origin"

This reverts commit 002993d6f06d6ddfaaf05532eb8d100fe8ba9220.
Revert "reversed so origin is top left again"

This reverts commit 89d7cdf4b3781356ab7106bf924d49ca85215e9f.
added own mouse position methods
mouse coordinates now use mathematical coordinates, too