Generalize IntegerSetting into NumberSetting, add Integer/Float wrappers

src/components/settings_modal/helpers/float_setting.vue

src/components/settings_modal/helpers/integer_setting.vue

src/components/settings_modal/helpers/number_setting.js

src/components/settings_modal/helpers/number_setting.vue

src/components/settings_modal/tabs/general_tab.js

src/components/settings_modal/tabs/general_tab.vue