Add validation/parsing for the FlexboxLayout properties

Make FlexboxLayout work with CSS properties, shorhands are not yet supported

Make shorthand properties

Remove redundant logging

tns-core-modules/utils/types.d.ts

@@ -13,6 +13,13 @@
      */
     export function isNumber(value: any): boolean;
 
+    /**
+     * A function that checks if something is a valid boolean.
+     * @param value The value which will be checked.
+     * Returns true if value is a boolean.
+     */
+    export function isBoolean(value: any): boolean;
+
     /**
      * A function that checks if something is a function.
      * @param value The value which will be checked.

tns-core-modules/utils/types.ts

@@ -6,6 +6,10 @@ export function isNumber(value: any): boolean {
     return typeof value === "number" || value instanceof Number;
 }
 
+export function isBoolean(value: any): boolean {
+    return typeof value === "boolean" || value instanceof Boolean;
+}
+
 export function isFunction(value: any): boolean {
     if (!value) {
         return false;