[bug] Timeline view bugs when columns no. ≠ 7

[yoyothepro1516]

When the column number is less than 7:

1. Today button does not work (e.g., for columns no. = 6, on the 25th of Jul, the today button brings you to the 19th- 24th; the 25th is not there, but it would be if there is one more column)
2. Forward and backwards buttons skip days (continuing the scenario, pressing the forward > button skips the 25th and shows the 26th- 31st; the next 6 days after the 25th; likewise, pressing the backward < button skips the 18th, showing the 12th to 17th)
   When the column number is more than 7:
3. It refuses to show more days than seven days (on columns no. = 8, it still shows the 19th-25th but will have an empty column to the right)
4. Forward and backwards buttons also skip days (continuing the scenario, the next page skips to the 2nd of August; going back a page is normal, but still only 7 columns)

The same bugs basically apply to the "Planner" view as well

Note: I found this bug when I accidentally put 22 in the box, so maybe make it a choice of column numbers instead of a box? I don't code, so I am unsure if this would be easier

Please don't worry too much about this bug; 7 days would still be the most commonly used, which means the bug would not affect much.

Love this plugin :)