Add try-catch-finally support: parse and generate opcodes for this construct

Fix varg generation: generate *_n opcodes with parameters in following meta opcodes
Add stack internal structure: dimanically allocated stack.
Use dynamically allocated memory in parser: every local and global variables are stored in dinamically allocated stacks.
Use dynamically allocated memory in serializer: opcodes are also stored in stack.
Change is_true_jmp and is_false_jmp opcodes to relative.
Change *jmp* opcodes to be able to store opcode_counter_t instead of idx_t.

src/libjsparser/lexer.h

@@ -138,12 +138,7 @@ typedef struct
 {
   token_type type;
 
-  union
-  {
-    keyword kw;
-    uint8_t uid;
-  }
-  data;
+  uint8_t uid;
 }
 __packed
 token;