Add ESLint for Code Readability & Fix Various Issues (issue #30 and pr #97)

[erdemozveren]

This PR adds ESLint to help with code readability and catch common syntax issues, I did my best for linter rules to not interfere with library logic. Also, it includes a couple of fixes that I encounter:

• Candle remaining time display: now it's works for all timeframes. see fix display of candle remaining time #97
• Timezone mismatch issue: Fixed a bug where setting the timezone to something like 1.5 in a 1-hour timeframe was breaking the bottom bar. Its also happening with integer timezones too, see When I set the time zone, the BOTBAR is not displayed #30

With these changes, the code should be a bit cleaner, and these bugs should be resolved!

Changes:

• Added ESLint and set up the config.
• Fixed small syntax issues spotted by ESLint.
• Refactor the candle remaining time logic.
• Commented out a line to fix the timezone issue with the bottom bar.

Testing:

• ESLint runs without any errors.
• Candle time and bottom bar are working fine now.
• Run stack.execAll() and got no errors and everythings seems to be working (idk if its throw any but seems alright to me)

Hope this library doesn't die. I switched to this from TVJS, and it seems to be the best of both worlds.
Let me know if any adjustments are needed! 🚀

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