I've only performed basic steps to allow the engine to be multiplatform.
Major classes such as FileAccess, various Stream implementations and so on need to be updated accordingly.
The FileAccess class is an almost 1:1 rewrite of the old FileAccess class from v1-alpha9, just with some method names changed, a set of "verify" methods, no setPosixPermissions method anymore and wrapper exceptions around Java exceptions to avoid direct contact with Java stuff for public API. See the NonKotlinContact annotation for more information.
The old FileAccess class (for reference): 1e978e3146/base/src/main/java/de/staropensource/engine/base/utility/FileAccess.java
