log format changed

[chenyue229266]

I've changed the format of the log.

For example, there were four original logs:

[=>] JavaScript_Execute | someJavascriptCode
    [=>] Element::getAttribute | manifest
    [<=] Element::getAttribute | Normal Exit
[<=] JavaScript_Execute | Normal Return"

Now, these four logs become:

<log level="0">
    <code name="javascript" type="call">
        someJavascriptCode
    <\code>
<\log>

<log level="1">
    <func class="Element" name="getAttribute" type="call">
        manifest
    <\func>
<\log>

<log level="1">
    <func class="Element" name="getAttribute" type="return">
        Normal Exit
    <\func>
<\log>

<log level="0">
    <code name="javascript" type="return">
        Normal Return
    <\code>
<\log>