Add finish debugger command. (#2240)

With this command the engine continue running just after the function
in the current stack frame returns.

JerryScript-DCO-1.0-Signed-off-by: Imre Kiss kissi.szeged@partner.samsung.com

tests/debugger/do_finish.expected

@@ -0,0 +1,20 @@
+Connecting to: localhost:5001
+Stopped at tests/debugger/do_finish.js:15
+(jerry-debugger) finish
+out: finish-test
+Stopped at tests/debugger/do_finish.js:26
+(jerry-debugger) finish
+Stopped at tests/debugger/do_finish.js:18 (in foo() at line:17, col:1)
+(jerry-debugger) finish
+out: foo
+out: bar
+Stopped at tests/debugger/do_finish.js:42
+(jerry-debugger) step
+Stopped at tests/debugger/do_finish.js:29 (in dog() at line:28, col:1)
+(jerry-debugger) finish
+out: *bark*
+out: *sit*
+out: *bark*
+Stopped at tests/debugger/do_finish.js:44
+(jerry-debugger) continue
+out: END: finish-test