Adds a new editable grid view and a timesheet grid to make entering and reviewing timesheet data in a matrix format easier. This is intended to replace the older timesheet sheet workflow, though validation and approval flows still need final product decisions.

Replacement for the timesheet sheet (?)

Depends on odoo/odoo#11466

The biggest missing part at this point (outside of "support for a bunch of field types & customisation" which'll be added when new matrix views get implemented) is where and how timesheet validation should be handled. Currently the workflow is on timesheet sheets which are submitted and approved, but there is no timesheet sheet here.

@fp's suggestion is to add a date flag to employee forms, updated (via a button of some sort) by the validator and "validating" all previous analytic lines related to the employee, with submission of timesheet sheets being removed.
- should that action be performed by a matrix or list view?
- would the validator see all timesheet data or per-employee?
- how would that data be accessed? Button on the employee sheet? Other?
## to fix
- [x] date/datetime row fields
## todo
- [ ] make line name ("description") optional?
- [x]  improve form view: [project, task] column 1 and [date, quantity] column 2

The expense reporting pivot view can now be clicked to open the related expense records. This makes it easier for users to move from summarized figures to the underlying details without extra searching.

Task: 
https://www.odoo.com/web#id=21648&view_type=form&model=project.task&action=327&menu_id=4720
Pad: https://pad.odoo.com/p/r.0Ci1k7SrWDutG6Tf

Opportunity forms now avoid overwriting existing contact information when related customer details are updated or selected. This helps sales teams preserve manually entered lead information and reduces accidental data loss in CRM workflows.

Task :https://www.odoo.com/web?#id=21671&view_type=form&model=project.task&action=333&active_id=131&menu_id=4720
Pad:https://pad.odoo.com/p/r.Bqa68G4vYlGC5eEG

After a report is printed successfully, the related wizard now closes automatically. This reduces extra clicks for users and makes the reporting flow smoother.

Task: https://www.odoo.com/web#id=12192&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/r.kh4WOD8prXoQPnoe

Improves how grouped report results handle date ranges and filtering details, making downstream website and inventory features more reliable. It also fixes reordering rule counts in stock so users see more accurate inventory planning information.

- fixes pieces of code which went to dig into read_group's domains
- add non-rpc (for now) "read_group_raw" which provides access to the underlying programmatic ranges of date/datetime values

/cc @odony @tivisse

Fixed an issue where clicking the blog comment button a second time could leave the article content shifted out of place. The comment popover is now better aligned and sized so readers and editors see comments more clearly.

...cond time and popover is already open then move the content back to original position

Task: https://www.odoo.com/web?#id=12207&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/r.7BeSK5dhVDXhyKVh