Add support for bytecode generation to cpm and IDE

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.