improved page layout (#761)

* app-layout component

* layout theme reorg

* merge app-layout styles

* rework page layouting

src/app/components/layout/layout.module.ts

@@ -26,12 +26,16 @@
 import { NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { CoreModule } from '@alfresco/adf-core';
-import { LayoutComponent } from './layout.component';
+import { AppLayoutComponent } from './app-layout/app-layout.component';
 import { ContentModule } from '@alfresco/adf-content-services';
 import { RouterModule } from '@angular/router';
 import { AppSidenavModule } from '../sidenav/sidenav.module';
 import { AppCommonModule } from '../common/common.module';
 import { AppHeaderModule } from '../header/header.module';
+import { PageLayoutComponent } from './page-layout/page-layout.component';
+import { PageLayoutHeaderComponent } from './page-layout/page-layout-header.component';
+import { PageLayoutContentComponent } from './page-layout/page-layout-content.component';
+import { PageLayoutErrorComponent } from './page-layout/page-layout-error.component';
 
 @NgModule({
   imports: [
@@ -43,7 +47,19 @@ import { AppHeaderModule } from '../header/header.module';
     AppSidenavModule,
     AppHeaderModule
   ],
-  declarations: [LayoutComponent],
-  exports: [LayoutComponent]
+  declarations: [
+    AppLayoutComponent,
+    PageLayoutComponent,
+    PageLayoutHeaderComponent,
+    PageLayoutContentComponent,
+    PageLayoutErrorComponent
+  ],
+  exports: [
+    AppLayoutComponent,
+    PageLayoutComponent,
+    PageLayoutHeaderComponent,
+    PageLayoutContentComponent,
+    PageLayoutErrorComponent
+  ]
 })
 export class AppLayoutModule {}