More styling options for InputField & TextField

[enisn]

Now the following styles are applicable to InputField & TextField

<Style TargetType="Label" Class="InputField.Title">
    <Setter Property="FontAttributes" Value="Bold" />
    <!--...-->
</Style>

<Style TargetType="Border" Class="InputField.Border">
    <Setter Property="MaximumHeightRequest" Value="80" />
    <!--...-->
</Style>

<Style TargetType="Image" Class="InputField.Icon">
    <Setter Property="HeightRequest" Value="10" />
    <Setter Property="WidthRequest" Value="10" />
    <!--...-->
</Style>

<Style TargetType="HorizontalStackLayout" Class="InputField.Attachments">
    <Setter Property="Spacing" Value="8" />
    <!--...-->
</Style>
<Style TargetType="Path" Class="InputField.ValidationIcon">
    <Setter Property="Fill" Value="MediumVioletRed" />
    <Setter Property="Data" Value="M7 11V1H8V11H7ZM8 13V14.01H7V13H8Z" />
    <!--...-->
</Style>

<Style TargetType="Label" Class="InputField.ValidationLabel">
    <Setter Property="TextColor" Value="MediumVioletRed" />
    <!--...-->
</Style>

<Style TargetType="Path" Class="TextField.ClearIcon">
    <Setter Property="Fill" Value="LightGray" />
    <Setter Property="Data" Value="M1.5 1.5L13.5 13.5M1.5 13.5L13.5 1.5" />
    <!--...-->
</Style>