FancyZones: improve windows and apps filtering (#673)

Unifies the way windows are considered "interesting" by FancyZone.
Berfore the change WinKey + arrows would use different method than
dragging. This PR makes both use the WinKey + arrows method.

Cleans up FancyZones Settings.cpp by removing m_configStrings variable.
Contrary to its name it was used to create color picker control.

Adds a multiline option to the text input to settings. Uses this to
provide the user with a way to exclude certain apps from snapping to
zones.

src/settings-web/src/components/StringTextSettingsControl.tsx

@@ -9,7 +9,8 @@ export class StringTextSettingsControl extends BaseSettingsControl {
     super(props);
     this.textref = null;
     this.state={
-      property_values: props.setting
+      property_values: props.setting,
+      multiline: !!props.setting.multiline
     }
   }
 
@@ -28,6 +29,10 @@ export class StringTextSettingsControl extends BaseSettingsControl {
     // Renders a UI Fabric TextField.
     return (
       <TextField
+        styles={{ fieldGroup: {
+          width: '350px',
+          alignSelf: 'start' 
+        }}}
         onChange = {
           (_event,_new_value) => {
             // Updates the state with the new value introduced in the TextField.
@@ -42,6 +47,7 @@ export class StringTextSettingsControl extends BaseSettingsControl {
             this.parent_on_change();
           }
         }
+        multiline={this.state.multiline}
         value={this.state.property_values.value}
         label={this.state.property_values.display_name}
         componentRef= {(input) => {this.textref=input;}}