Implement a Pattern for simple character classes

This adds support for single-letter patterns such as "[^0-9]".

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add regex-handling specifically for ImgLib2-meta

Thanks, Barry... ;-)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Implement Arrays#copyOf(long[], int)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Implement rest of the Arrays#fill family

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Implement the Math#signum method

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
wip

wip