Ignore Java/Eclipse files

Signed-off-by: JWhy <jwhy@jwhy.de>
Implement number generator (~CNS.java) and filter (UniqueNumber.java)

Signed-off-by: JWhy <jwhy@jwhy.de>
Implement low-memory optimized class that filters BEFORE saving

Signed-off-by: JWhy <jwhy@jwhy.de>