support escape sequences inside string literals

[Al]

tan/src/lexer/lexer.cpp

Lines 155 to 160 in 12ad011

 // TODO: support escape sequences inside string literals 
 // TODO: check line breaks inside two quotation marks 
 token *tokenize_string(Reader *reader, code_ptr &start) { 
     token *t = nullptr; 
     auto forward = reader->forward_ptr(start); 
     forward = skip_until(reader, forward, '"'); 

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This issue was generated by todo based on a TODO comment in 12ad011 when #6 was merged. cc @tjysdsg.