MA and Channel overlay

Some overlay utilities:

- Draw 3 moving averages (MA) with circles line.
- Option to choose type of MA to plot.
- Draw start point of those MA with a big cross.
- Option to draw channel: Donchian, Bollinger and Envelope.
- Option to draw stop loss line: ATR or Percentage.
- Draw background color in monthly, weekly, daily, intraday, ... chart (remember to choose your correct timezone if using intraday chart).
- Draw a label of last price.
- Draw next prices.

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Added comments and showed stop loss line for demo purpose.

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Option to show / hide MAs.

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New chart view.

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Add intraday labels which show day number in month and weekday name.

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Add hour range to draw sleep time in intraday chart.

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Fixed time zone issue for exchange that has non-UTC timezone.

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Fix weekly background issue.

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Fix channel len issue.

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- Use TDEMA as the default MA now.
- Use bigger periods to catch trend easier.
- Drawed a band between small and medium period (MA1 and MA2) lines.
- The position of this band and the big period line (MA3) is the key to check the trend now.