This adds support for generating binary and optimised ABC code to cpm and the IDE.

In target environments, four new options are added:

• EnvironmentABCOptimise, path to the ABC optimiser (generates <module>.opt.abc from <module>.abc)
• EnvironmentByteCodeGen, path to the bytecode generator (generates <module>.bc from <module>[.opt].abc)
• EnvironmentByteCodeLink, path to the bytecode linker (generates one <application>.bc from all bytecode files)
• EnvironmentByteCodeStrip, path to the bytecode stripper (strips an <application>.bc, overwriting that file)

In project files, four new options are added:

• ByteCode, path to the main bytecode file to generate (result of the bytecode linker)
• CodeGen/OptimiseABC, boolean indicating whether to generate optimised ABC code
• CodeGen/GenerateByteCode, boolean indicating whether to generate bytecode
• Link/StripByteCode, boolean indicating whether the bytecode stripper should be used

Notes:

• The default behaviour is unchanged: no bytecode is generated when these options are absent.
• When ByteCode is non-empty but CodeGen/GenerateByteCode is false, some files may be missing which can lead to errors in the linking step.
• If CodeGen/GenerateByteCode is true but CodeGen/OptimiseABC is false, we generate bytecode from the unoptimised ABC files. This has no real use case for now.
• Link/StripByteCode should be false to use the serialization library, but can be true if you just want to run the interpreter stand-alone for example).
• In the IDE one can set all project options except Link/StripBytecode, which has no real use case for now.