* Add global Lua function 'some'
Moved documentation for 'each' function to non-standard section.
* Revert "Add optional argument to template.each for empty collection output (#1359)"
This reverts commit b73dadec67.
* Reimplement #1359 using 'some' function
When omitted, the function outputs empty string for empty table as before.
The feature was motivated by the Maintenance page in v1 that showed messages
instead of just empty blocks (ported over).
- Added slash commands for inserting today's, yesterday's, and tomorrow's dates.
- Introduced new admonition commands for notes and warnings.
- Implemented a table command for quick table insertion.
- Enhanced the `insertAtCursor` function to support a cursor placeholder option.
- Updated `getSelection` to return the selected text along with cursor positions.
- Added a new widget function to display linked tasks in the editor.
