YAMLParser now supports YAML lists not parsed by the parser itself.

This means that list of type
```yaml
list:
  - test: "Hello"
  - test: "Hi"
```
will be parsed as a list of (ConfigurationSection)[src/main/java/it/fulminazzo/yamlparser/configuration/ConfigurationSection].
Totally reworked classes separation to respect packaging conventions.
Reworked FileConfiguration#addParsers method.
Renamed `it.fulminazzo.yamlparser.configurations` package to `it.fulminazzo.yamlparser.configuration`.
Made FileConfiguration and ConfigurationSection final.
Added support for escaped dot characters: now it will be able to use `\.` in paths to allow for dotted strings to be parsed.
Added support for BigDecimal notation when getting Number types.
Added `unquote` method to remove quoted strings when saving or loading.
Added `getOptional` method.
Now IConfiguration extends Serializable.
Reworked `FileConfiguration#newYaml` method to support older versions of SnakeYAML.
Fixed dotted test error.
Fixed `IConfiguration#getKeys` not returning an ordered set.
Fixed NullPointerException in `IConfiguration#throwException` method.
Fixed MapYAMLParser not supporting primitive types.
Fixed `FileConfiguration#getParser` method to look first for equal object classes.
Fixed `CollectionYAMLParser` not returning null values in non-specified indexes.
Updated README.md.
Updated FulmiCollection.

build.gradle

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = 'it.fulminazzo'
-version = '1.5.11'
+version = '1.5.12'
 
 repositories {
     mavenCentral()

src/main/java/it/fulminazzo/yamlparser/parsers/CollectionYAMLParser.java

@@ -33,7 +33,14 @@ public CollectionYAMLParser(@NotNull Class<C> aClass) {
         return (c, s) -> {
             if (c.isConfigurationSection(s)) {
                 @Nullable Map<Integer, T> map = mapYamlParser.load(c, s);
-                return map == null ? null : (C) map.values();
+                if (map == null) return null;
+                List<T> result = new LinkedList<>();
+                for (Integer k : map.keySet()) {
+                    if (k < 0) throw new IllegalArgumentException(String.format("Invalid number '%s'", k));
+                    while (result.size() - 1 < k) result.add(null);
+                    result.set(k, map.get(k));
+                }
+                return (C) result;
             }
             else return (C) c.getObject(s);
         };