Rename selector to variable

[compile] [variable] add README.md and renames (#28)

* [compile] add compile option WithConf

* [compile] rename compile config

* [compile] rename selector to variable

* [compile] rename with env to RegVarAndOp

* [compile] change unknown variable to undefined variable

* [readme] add README.md

* [readme] update README.md

* [readme] update README.md

* [readme] update README.md

v1.1.0: [event] [compiler] update event (#24)

* [compile] update event node

* [util] update DumpTable

* [compile] update is fast op

* [util] fix

* [util] add …

* [util] update test

v1.0.0

[compile] add stateless operators config (#22)