Manage unplaceable tile

[SnowyCoder]

There are some situations in which you cannot place the tile you drew from the bag, these should be found and managed correctly.
To find this situation multiple solutions may be implemented.
I want to write down a quite efficient solution: Storing the available spaces in a Trie<Array, TilePosition> will allow us to index the empty slots in a way that will support O(1) insertions and deletions.
The idea is simple: each empty tile near a card should be indexed in the trie with the expected sides (or null if all sides are possible). When a card is drawn, the program can match the card sides against the trie (this isn't a primitive query but it can be implemmented quite easily).

[SnowyCoder]

First solution implemented in 4db953a, but there are some problems:
There is no animation (so the user will not know wether an unplaceable card has been drawn or not).
There is no optimization: we use a bruteforce method to discover possible tiles.
In the tileDB.ts file possible optimizations are discussed.