Fixes some incompatibilities with scala-ide 4.6

Now BundleConstructor will construct ExposedFunc objects after all
functions are created.

This will allow mu-client-pypy to use this hack in the master branch by
setting the --uPtrHack=true VM option.

It should treat the string parameter as an iref to a 0-terminated
string.

fix suggestion of the forgotten definition for sizeOf(IRBuilderRef)

See merge request !3

- Implemented @uvm.irbuilder.new_ir_builder

- Fixed @uvm.irbuilder.gen_sym where the %name parameter should be optional

Now "automagic relocation" can be enabled by a VMConf option
"automagicReloc".  It is disabled by default.

Manual symbols can be added via the make_boot_image api function.

Note: curently manual symbols can only be used during boot image
building, and can be used for relocations, only.  At run time, the
manual symbols are invisible, because Holstein cannot actually generate
ELF (or MachO) images compatible with native programs.

Moved from the deprecated "flat" sbt project definition style to the
recommended "multi-project" style.

Bumped dependency versions.

This will fix the problem that some memory is reclaimed by the GC before
the intended end-of-life. Now many classes implement the AutoCloseable
interface and manage their resources in the C++ style.

The normal destination may use the results of the instruction. So the
excClause needs to be created after the instruction is created and the
results are created.

Need testing...

mar.py as a importable function

Put the functionality of mar.py as a importable function that can be used in RPython compiling tool chain.

See merge request !1