FXT files are not exactly CLEO-compatible

[CookiePLMonster]

1. CLEO rtrims whitespace, modloader does not. The game doesn't like texts with trailing whitespace.
2. GTA III and Vice City have a bug in PrintString where they over-read the string one character past the null terminator. This can crash if the FXT string lands exactly at the page boundary and is immediately followed by unreadable data. This can be fixed easily by simply double null-terminating each string.