ChatViewFooter: apply the new design

resources/icons/Bold_Black_24dp.svg

resources/icons/Bullet-number_Black_24dp.svg

resources/icons/Bullet-point_Black_24dp.svg

resources/icons/Code_Black_24dp.svg

resources/icons/Italic_Black_24dp.svg

resources/icons/Link_Web_Black_24dp.svg

resources/icons/Quote_Black_24dp.svg

resources/icons/S-Barre_Black_24dp.svg

resources/icons/Text-Edit_Black_24dp.svg

resources/icons/Title_Black_24dp.svg

src/app/appsettingsmanager.h

src/app/commoncomponents/MarkdownPopup.qml

src/app/commoncomponents/PushButton.qml

src/app/constant/JamiStrings.qml

src/app/constant/JamiTheme.qml

src/app/mainview/MainView.qml

src/app/mainview/components/ChatViewFooter.qml

src/app/mainview/components/KeyboardShortcutTable.qml

src/app/mainview/components/MessageBar.qml

src/app/mainview/components/MessageBarTextArea.qml