add `icaro build`

[LGala]

• if we are in an Icaro project
  • compile the code:
    • read the langVersion from deps.json
    • launch java -jar $ICARO_HOME/lang/<langVersion> <pathToSrcDir> <pathToBin> and create the .class (s) inside the .bin/classesdir
    • inside the .bin dir create the <projectName>.jar file from the .class (s)