UPGRADE FROM 2.0-ALPHA3 to 2.0-ALPHA8

Rollerworks\Component\Search\Doctrine\Dbal\StrategySupportedConversion::getConversionStrategy method not must return an integer. And requires a return-type is set.

UPGRADE FROM 1.x to 2.0

Support PHP 5 is dropped you need at least PHP 7.1
The Cache implementation now depends on PSR-16 (SimpleCache) instead of the Doctrine Cache library.
The WhereBuilder class had been renamed to SqlConditionGenerator.
The WhereBuilderInterface has been renamed to ConditionGenerator.
The CachedConditionGenerator (was CacheWhereBuilder) class no longer allows configuring the cache key. The Cache key is now automatically computed based on the FieldSet (name), serialized root ValuesGroup and Field mappings (except field options).
Not setting a Cache implementation for the Factory will simple disable the cache and will no longer throw an exception when creating a CachedConditionGenerator.
The CachedConditionGenerator and SqlConditionGenerator now strictly implements the same interface. Meaning the CachedConditionGenerator can be used for configuring the decorated SqlConditionGenerator.
The QueryField properties are now public, all getter methods have been removed;

The column property now includes the table alias (if any), use the tableColumn property to get actual column name with alias.

The prototype signature setField changed to setField(string $fieldName, string $column, string $alias = null, string $type = 'string').
The setField method now allows configure secondary mappings for the same field. This replaces the setCombinedField method.

Before:
```
$conditionGenerator->setCombinedField('customer-name', [
    ['column' => 'first_name', 'type' => 'string', 'alias' => 'c'],
    ['column' => 'last_name', 'type' => 'string', 'alias' => 'c'],
]);
```
After:
```
$conditionGenerator->setField('customer-name#first_name', 'first_name', 'c', 'string');
$conditionGenerator->setField('customer-name#last_name', 'last_name', 'c', 'string');
```
The name of a mapping begins with the field-name as registered in the FieldSet, followed by # and the name of the mapping (used for debugging).

Caution: A field can only have multiple mappings or one, omitting # will remove any existing mappings for that field. Registering the field without # first and then setting multiple mappings for that field will reset the single mapping.
The setCombinedField method has been removed.
The setField method no longer accepts DBAL types as object, use a string for the type instead.

Conversions can no longer be configured on a ConditionGenerator, use the FieldType to configure a Conversion for the field.

The getFieldConversions and getValueConversions methods have been removed.
Conversions now always apply at the SQL level, the ValueConversion::convertValue method is now expected to return an SQL value statement.

Caution: The value is not escaped by the search system, the conversion must handle proper escaping and quoting of the value!

The requiresBaseConversion method is removed.
Renamed SqlFieldConversionInterface to ColumnConversion
Renamed SqlValueConversion to ValueConversion
Renamed ConversionStrategyInterface to StrategySupportedConversion