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use vm config

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Revert "use vm config"

This reverts commit a5592cfd8fa2bfec04feb33e70f4bf1dae970be8.
Adding isEmpty and isNotEmpty
Changing removeAll to clear()

Changing removeAll to clear() per dart convention
Concurrent modifications
version increment
Improved concurrent modifications

When adding/removing a signal during that signal's dispatch, it will be
added/removed at the end of the dispatch.
improved documentation
blix_signals library name
removed a typo
readme
readme
performance improvements and benchmarks

Removed duplicate detection, it was too costly for its value.
Improved speed by about 30x
added contains(Handler)
contains test was in wrong group
isEmpty concurrent modification bugfix

linked list made generic
trivial change
benchmark cleanup