#716 - new icons for budgets

BudgetMasterServer/src/main/resources/static/css/style.css

...er/src/main/resources/static/images/piggy_expenditure.svg

...rServer/src/main/resources/static/images/piggy_income.svg

...terServer/src/main/resources/static/images/piggy_rest.svg

...rc/main/resources/templates/transactions/transactions.ftl

build/icons/piggy_expenditure.svg

build/icons/piggy_icons.gvdesign

build/icons/piggy_income.svg

build/icons/piggy_rest.svg