[FIX] set company_id when creating tax from template, set amount in tax line as per tax rate in invoice configuration view.
[WIP] account: refactoring of taxes new design
[REF] account: refactoring of taxes (new design). Made clean schema. Refactored and fixed the code in several places. WIP
[FIX] account : Fixed the mapping of account tax template and configurable chart of account.
[IMP]l10n_ec,l10n_pl,l10n_ve: improved demo data of account tax template as per the new design of tax.