In Agency Settings -> Rental Conditions and Property -> Rental Conditions, add the ability to use template variables and HTML formatting.

Some examples of how we could use this:
- Use variables in the Agency Rental Conditions to include property-specific information, allowing us to have a single common text.
- Include specific booking data such as damage waiver, number of nights, the actual guest name, etc.
- The ability to format the conditions makes it far easier for a guest to read and understand.