rename refactor

[aviatesk]

UPDATED: moved to #203

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Purpose

Implement rename refactoring command:

• rename local binding
• rename global bindings (module-based)

Approach

• use MacroTools.jl for easy tokenizing and code replacing
• for module-based global refactoring, CSTParser-based static file detection is used:
  • since our Revise-like module file detection will easily fail with the refactorings, which breaks precompilation cache
• first tries local refactoring, and then move to global refactoring if needed
• rename refactoring on fields is all suppressed, since not every code is statically typed and so I think we would end up with lots of false positive
• global refactoring are designed to work only when it's called on the definition place

Task / Achievements

• local refactor
• module-based global refactor
• graceful messages
  • notice the need of refactoring in the parent module if the refactored binding is imported/overloaded
  • report back error message
  • notice refactored files
  • show context
• handle edge cases
  • suppress keyword refactoring
  • suppress field refactoring
  • suppress global refactoring that are not called at a definition place
  • halt global refactoring if files without write permission detected
  • global refactoring with dot accessor like Atom.isdebugging(), Base.countlines(args...)
  • global refactoring on macro
• test