Mesh editor refactor

[kisslorand]

Requirements

BTT or MKS TFT

Description

• Mesh editor refactored once again to a more comprehensive version.
• The mesh data is stored now just as it is stored in the mainboard's eeprom so row mirroring is not needed anymore, it won't create anymore any confusion.
• Some unnecessary variables and flags were removed by a more logical data handling.
• PR #2781 broke the circular column navigation in "MeshEditor" menu when using the screen touch controls (left, right); it has been restored without affecting the rotary encoder's linear navigation style.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

This PR has been automatically marked as stale because it has had no activity for the last 60 days. It will be closed in 7 days if no further activity occurs. Thank you for your contribution.