New java-compiler for the online-ide

This compiler/interpreter combo (work in progress...) understands a fairly large subset of the java programming language and transpiles it stepwise into individual javascript functions. These can then be executed inside a browser step by step. The compiler is a replacement for the old one that is currently integrated in the online-ide. Main difference is that there is no more intermediate language (P-Code) needed. Initial tests indicate that the new compiler/interpreter combo executes java code about 50 times faster than the old one.

Features (done)

• primitive types (int, long, double, ...)
• classes, interfaces, enums, records, arrays
• classes String, Math
• for, while, if...else
• break, continue
• switch statement
• simplified for-loop over collections
• class ArrayList
• try...catch...finally (exceptions)
• generics (with wildcard-operator!)
• named inner classes
• anonymous classes
• lambda functions
• function declarations in main program
• class Thread/multithreaded execution
• locking, wait, notify
• synchronized methods/blocks
• semaphors (not yet tested)

Features (in progress)

• REPL-mode
• port whole Onlne-IDE API to new compiler (2 %)
• rich semantic support for editing sourcecode in the monaco editor