add dot expression
dot parse a function and call it
refect to suffix+s expression farmal
Bracket and dot expression basic tests passed.
check nil from bracket eval
add time and duration type define
add channel
try add reflect type as type define as gisp parser created
ext type system basic test pass
ext type set test pass
NewGisp without error
add less and less option and list compare tests
重构 dot 解析逻辑。
将所有的公理和定理表达式封装成函子，这其实在修改了函子的构造逻辑以后，不再是必须的。只是Toolkit不能以强类型容纳Expr和函子的情况下做的
妥协。
简化toolkit的构建
rename parsec.go to parses.go
many1 digit test passed
skip spaces
fix let def and set errors
add parsec support