LDoc: Allow additional fields in enum objects

[jakubg1]

Right now, to add a field to an enum object that is applicable to any of the types, you have to clone it in all of the choices. Make it possible to add such fields by assigning them a name.

Example:

- (object) {type: Type of the Collectible Generator Entry.} - A collectible generator entry.
    - "collectible" - Evaluates to a single collectible.
        - name (string) - A collectible ID to be evaluated to.
        - conditions* (array) - A list of conditions. All of them must be satisfied. In other case, this entry will not generate any collectibles and return an empty list.
            - (%boolean) - A single condition.
    - "collectibleGenerator" - Evaluates to another collectible generator result.
        - generator (CollectibleGenerator) - Path to another Collectible Generator which will be evaluated.
        - conditions* (array) - A list of conditions. All of them must be satisfied. In other case, this entry will not generate any collectibles and return an empty list.
            - (%boolean) - A single condition.
    - "combine" - Evaluates a list of given entries and returns a list of all collectibles generated.
        - entries (array) - A list of collectible entries to be evaluated.
            - (#) - A single collectible generator entry.
        - conditions* (array) - A list of conditions. All of them must be satisfied. In other case, this entry will not generate any collectibles and return an empty list.
            - (%boolean) - A single condition.
    - "repeat" - Evaluates a given entry a number of times and returns a list of all collectibles generated.
        - entry (#) - A collectible entry to be evaluated.
        - count (%integer) [>=2] - How many times the entry should be evaluated.
        - conditions* (array) - A list of conditions. All of them must be satisfied. In other case, this entry will not generate any collectibles and return an empty list.
            - (%boolean) - A single condition.
    - "randomPick" - Evaluates all the choices, discards empty ones, and selects one of the remaining results at random.
        - pool (array) - A list of choices to be picked from.
            - (object) - A single choice.
                - entry (#) - A collectible generator entry to be evaluated.
                - weight* (number) [>0] - The bigger this number is, the more likely this option is to be chosen. Defaults to 1.
        - conditions* (array) - A list of conditions. All of them must be satisfied. In other case, this entry will not generate any collectibles and return an empty list.
            - (%boolean) - A single condition.

would turn into

- (object) {type: Type of the Collectible Generator Entry.} - A collectible generator entry.
    - "collectible" - Evaluates to a single collectible.
        - name (string) - A collectible ID to be evaluated to.
    - "collectibleGenerator" - Evaluates to another collectible generator result.
        - generator (CollectibleGenerator) - Path to another Collectible Generator which will be evaluated.
            - (%boolean) - A single condition.
    - "combine" - Evaluates a list of given entries and returns a list of all collectibles generated.
        - entries (array) - A list of collectible entries to be evaluated.
            - (#) - A single collectible generator entry.
            - (%boolean) - A single condition.
    - "repeat" - Evaluates a given entry a number of times and returns a list of all collectibles generated.
        - entry (#) - A collectible entry to be evaluated.
        - count (%integer) [>=2] - How many times the entry should be evaluated.
            - (%boolean) - A single condition.
    - "randomPick" - Evaluates all the choices, discards empty ones, and selects one of the remaining results at random.
        - pool (array) - A list of choices to be picked from.
            - (object) - A single choice.
                - entry (#) - A collectible generator entry to be evaluated.
                - weight* (number) [>0] - The bigger this number is, the more likely this option is to be chosen. Defaults to 1.
    - conditions* (array) - A list of conditions. All of them must be satisfied. In other case, this entry will not generate any collectibles and return an empty list.
        - (%boolean) - A single condition.

[jakubg1]

Partially implemented in 9b2196e (works for Config Classes, but doesn't work for schemas yet).