Add test for let with symbol
Convert bound variable name to unique symbol

(Alpha conversion)
Show original variable name on compile error
Make inlined function to refer original (defined) scope #100

not to shadow global variable reference.
Merge branch 'feature/alpha-conv' into develop
Insert `return` continuation to exit `defun`ed function
Add `str-stream` function to create stream from string in Lisp
Implement get/set-dispatch-macro-character
Read vector literal using dispatch macro char
Move read time eval from C code to dispatch macro char
Move block comment reader from C code to dispatch macro char
Remove handling for shared structure

shared structure is handled in other place.
Merge branch 'feature/dispatch-macro' into develop
Change quasiquote to quote
Add implementation note