refactor(components): add icon module and missing imports

src/components/datetime/datetime.module.ts

@@ -1,10 +1,13 @@
 import { CommonModule } from '@angular/common';
 import { NgModule, ModuleWithProviders } from '@angular/core';
 
+import { ButtonModule } from '../button/button.module';
+
 import { DateTime } from './datetime';
 
 @NgModule({
   imports: [
+    ButtonModule,
     CommonModule
   ],
   declarations: [

src/components/icon/icon.module.ts

@@ -0,0 +1,19 @@
+import { NgModule, ModuleWithProviders } from '@angular/core';
+
+import { Icon } from './icon';
+
+@NgModule({
+  declarations: [
+    Icon
+  ],
+  exports: [
+    Icon
+  ]
+})
+export class IconModule {
+  public static forRoot(): ModuleWithProviders {
+    return {
+      ngModule: IconModule, providers: []
+    };
+  }
+}

src/components/navbar/navbar.module.ts

@@ -3,10 +3,12 @@ import { NgModule, ModuleWithProviders } from '@angular/core';
 
 import { Navbar } from './navbar';
 
+import { ButtonModule } from '../button/button.module';
 import { IconModule } from '../icon/icon.module';
 
 @NgModule({
   imports: [
+    ButtonModule,
     CommonModule,
     IconModule
   ],