refactor(events): rename all Ionic events to start with ion

BREAKING CHANGES:

Renamed all Ionic events to start with `ion`. The following events were
renamed:

- **Checkbox**
  - `change` -> `ionChange`
- **DateTime**
  - `change` -> `ionChange`
  - `cancel` -> `ionCancel`
- **InfiniteScroll**
  - `infinite` -> `ionInfinite`
- **Menu**
  - `opening` -> `ionDrag`
  - `opened` -> `ionOpen`
  - `closed` -> `ionClose`
- **Option**
  - `select` -> `ionSelect`
- **Picker**
  - `change` -> `ionChange`
- **RadioButton**
  - `select` -> `ionSelect`
- **RadioGroup**
  - `change` -> `ionChange`
- **Refresher**
  - `refresh` -> `ionRefresh`
  - `pulling` -> `ionPull`
  - `start` -> `ionStart`
- **Searchbar**
  - `input` -> `ionInput`
  - `blur` -> `ionBlur`
  - `focus` -> `ionFocus`
  - `cancel` -> `ionCancel`
  - `clear` -> `ionClear`
- **Segment**
  - `change` -> `ionChange`
  - `select` -> `ionSelect`
- **Select**
  - `change` -> `ionChange`
  - `cancel` -> `ionCancel`
- **Slides**
  - `willChange` -> `ionWillChange`
  - `didChange` -> `ionDidChange`
  - `move` -> `ionDrag`
- **TabButton**
  - `select` -> `ionSelect`
- **Tab**
  - `select` -> `ionSelect`
- **Tabs**
  - `change` -> `ionChange`
- **Toggle**
  - `change` -> `ionChange`

Closes #6568

demos/infinite-scroll/main.html

@@ -10,7 +10,7 @@
     </ion-item>
   </ion-list>
 
-  <ion-infinite-scroll (infinite)="doInfinite($event)" threshold="100px">
+  <ion-infinite-scroll (ionInfinite)="doInfinite($event)" threshold="100px">
     <ion-infinite-scroll-content
       loadingSpinner="bubbles"
       loadingText="Loading more data...">

demos/radio/main.html

@@ -36,7 +36,7 @@
 
     <ion-item>
       <ion-label>Enable "Never"</ion-label>
-      <ion-toggle (change)="isDisabled = !isDisabled"></ion-toggle>
+      <ion-toggle (ionChange)="isDisabled = !isDisabled"></ion-toggle>
     </ion-item>
 
     <ion-item>

demos/refresher/main.html

@@ -4,7 +4,7 @@
 
 
 <ion-content>
-  <ion-refresher (refresh)="doRefresh($event)" (pulling)="doPulling($event)">
+  <ion-refresher (ionRefresh)="doRefresh($event)" (ionPull)="doPulling($event)">
     <ion-refresher-content
       pullingText="Pull to refresh..."
       refreshingText="Refreshing...">

demos/select/main.html

@@ -29,7 +29,7 @@
 
     <ion-item>
       <ion-label>Date</ion-label>
-      <ion-select (change)="monthChange($event)">
+      <ion-select (ionChange)="monthChange($event)">
         <ion-option value="01">January</ion-option>
         <ion-option value="02">February</ion-option>
         <ion-option value="03" checked="true">March</ion-option>
@@ -43,7 +43,7 @@
         <ion-option value="11">November</ion-option>
         <ion-option value="12">December</ion-option>
       </ion-select>
-      <ion-select (change)="yearChange($event)">
+      <ion-select (ionChange)="yearChange($event)">
         <ion-option>1989</ion-option>
         <ion-option>1990</ion-option>
         <ion-option>1991</ion-option>