Autocomplete paths in quotes

[mikucionisaau]

This feature requires some broader context awareness but would help users to write file-system paths as it is very cumbersome.

Currently there are the following rules requiring paths in quotes:

• ExternDecl: T_IMPORT T_CHARARR (the T_CHARARR)
• PropertyExpr: ... | T_SAVE_STRAT '(' Expression ',' Id ')' (the Expression part)
• AssignablePropperty: ... | T_LOAD_STRAT Features '(' Expression ')' (the Expression part)
• Expression: ... | T_CHARARR (in context of PropertyExpr and AssignableProperty)

ULS should suggest the folders and files that are readable (omit entries which result in access errors) and also suggest proper folder separator (either always stick to / or suggest \\ on Windows).