[IMP] l10n_be_hr_payroll: Update salary rules for belgian worker and employees

- Update the outdated ones:
	- Disabled Spouse Allowance
	- Child Allowance
	- Retain on Meal Voucher
	- Reimbursement of travel expenses
- Add missing rules:
	- Reduction for special family charges
	- Withholding Tax Reduction
	- Special social contribution
	- ATN Company Car
	- ATN Internet
	- ATN Mobile
	- Employment Bonus
	- Withholding Tax Reduction for Low Salaries
	- Withholding Tax Reduction for Low Salaries (ONSS)
	- Other family charges reductions
	- Reduction for isolated people
	- Reduction for isolated parent
	- Reduction for disabled employee
	- Reduction for dependent seniors
	- Reduction for dependent juniors
	- Reduction for low spouse revenue
	- Reduction for low spouse other revenue
	- Commission on Target
	- Representation Fees
- Add advantage templates with default values

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