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/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>