add holidays inout field cost

this is not yet hooked to any calculations
make outgoings presenter translatable
change committed and lifestyle cost categories
add fixed costs and change cost categories
fix feature specs
spending commitments now fixed + commited costs
interest rate changer considers fixed costs
replaced legends with p elements
set auto focus when navigating the wizard. Todo: refactor into a directive
add some breathing room to paragraphs
add people toggle to affordability step 1 form
add directives to form inputs for currency formatting
create a test for checking initial value of input when currency directive is used
start of affordability service refactor. Reimplement total income method and introduce a method to calculate total costs with a spec
refactor minimum and maximum borrowing methods
display offered range in view
add a method for calculating the median value between the minimum and maximum borrowing offered
extract borrowing into a partial to be used by the slider
plug in interest rate into repayment service. Introduce a spec to check affordability service uses the correct interest rate
implement monthly repayment method for affordability and delegate it to repayment sergice. include a spec to check if it works