Possible referenced nodes

[ivojawer]

Agrega un helper para saber a que nodos podria estar referenciando un nodo reference

Usado por uqbar-project/wollok-lsp-ide#205

Otros cambios:

• Fix printer de imports, ahora delega en el isGeneric que es lo correcto
• En los calculadores de source maps cambie un poco la logica para que queden bien los character cuando se cambia el offset (solo lo arregle para los casos donde es un nodo de una sola linea)

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.78%. Comparing base (d595ac1) to head (4d2eeb2).

Files with missing lines	Patch %	Lines
src/printer/print.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #334   +/-   ##
=======================================
  Coverage   89.78%   89.78%           
=======================================
  Files          28       28           
  Lines        3191     3201   +10     
  Branches      581      584    +3     
=======================================
+ Hits         2865     2874    +9     
- Misses        171      172    +1     
  Partials      155      155           

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