The jSignature lib is only used by the NameAndSignature component, which is not accessible on a many screens. This commit thus removes the lib and its extension from the bundles, and makes the NameAndSignature component load it on demand. Part of task~3439226 closes odoo/odoo#138054 Related: odoo/enterprise#48633 Signed-off-by: Samuel Degueldre (sad) <sad@odoo.com>