Revert "Revert "1. Fixed tags and settings manager opening (§1.1)""

This reverts commit 6aed7a2e3eb0554f06d0e3616ee6dde54c71b109.
1. Fixed tags and settings manager opening (§1.1)
2. Fixed LESS files for Settings manager (§1.2)
3. Realized adding new priority mechanism with validation (§2.1)
4. Realized scrolling down to the focus element when adding new priority group to DOM (§2.2)
5. Realized marking priority as removed (§2.3)
6. Realized save and reset function (§3.1)
7. Added some notations into issues.md

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1:
	1.1.	Now .distant class with .open class mixed up in setTimeout function. Now opening smooth and no overlay-y is hidden (user can scroll long settings manager);
	1.2.	Added matgin-bottom to setting-manager container box.

2:
	2.1.	User incrementing priority count flag when wants to add new priority. If user will click on the button plus and there is at least one empty priority name than an error message wil throw. No maximal count for priorities. Need to discuss does this feature should been realized.
	2.2.	When adding new priority group that expands settings manager container box - window scrolls down to the focus element;
	2.3.	User removes last priority group clicking by minus button (decrementing priority count flag). Priority group slides up and hiding with addition of class .tmp-hid to save or reset changes.

3:
	3.1.	Clicking "save" button all changes saving into DOM. Clicking "cancle" button all changes will be forgotten;