Inlining: exposed inlining thresholds as command-line parameters. (#2125)

* Inlining: exposed inlining thresholds as command-line parameters.

This will allow easier experimentation with optimal settings.

Also tweaked the default logic slightly to always inline single
caller functions up to a certain size.

The command-line arguments were tested to have the desired effect
for example by the Makefile change in this commit:
https://github.com/aardappel/lobster/commit/39ae393e27ff363ab095bbb26c90d6fe17570104
which in turn relies on:
https://github.com/emscripten-core/emscripten/pull/8635

* Grouped inlining options & reverted defaults.

Now uses same defaults for inlining as before for the sake of
not having to redo a lot of tests.

Added FIXME to indicate that the current inlining logic needs
fixing.

* Fixed default values now pulled from code.

* clang-format

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