With a better uvm.staticanalysys.StaticAnalyzer, Holstein should have
reject ill-formed Mu bundles if there are type errors.  Fixing this will
need refactoring, moving `uvm.refimpl.internals.scala` into a package
for general IR processing, not specific to the interpreter
implementation.

See #10

And apparently no Scala code is changed.

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

- 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.

Now MicroVM runs the static analyzer when adding any bundles.

- Tested load_bundle, composite types and memory ops.
- Fixed a bug in insertelement.

In theory, all Mu client API functions are available to C, but not all
are tested.  Now a client in C is known to be able to create stack,
thread, handle traps and introspect stacks.

A C client can now call API functions to convert between primitive C
values and Mu handles.

C client can call MuCtx methods and close it now. It looks like it's on
the right track.