Include external repo with the SOM standard library

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Remove embedded standard library

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Add sumlinks to restore repository layout

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed checkstyle configuration

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Method should not expose unnecessary implementation details

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added missing primitives

- System>>#fullGC:
- Integer class>>#fromString:
- Double>>#round

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Sqrt on integer should return integer if result is supposed to be one

Signed-off-by: Stefan Marr <git@stefan-marr.de>
String indexing is 1-based, fixed substring primitive

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added new tests to SomTests

Signed-off-by: Stefan Marr <git@stefan-marr.de>