[9.0] Payroll for BC

[max3903]

We estimated the effort to provide:

• [ ] the BC payroll rules in l10n_ca_bc_hr_payroll
• [ ] the BC payroll accounting in l10n_ca_bc_hr_payroll_account

to 5 days.

Please comment below (or send a mail to contact@savoirfairelinux.com) if you are interested to finance it.

Of course, dependencies will require to be migrated first and are not part of those 5 days:

• [ ] #75