Refactored Query mechanisn - Nesting mechanics.

[AndreaCatania]

• Refactored the Query mechanics, so it's now possible to combine the filters for fine-grained result!
• Removed Without filter in favor of Not.
• Now the Query return a QueryResultTuple (before it was returning std::tuple).
• Add QueryResultTuple for a great control over the query unpacking mechanism.
• Refactored the Any filter: Now it returns all the Components if one filter is satisfied.
• Add Join filter: Collapse many components to one.
• Refactored all the Filters to allow nesting.

// Take all entities with transform component
Query<Transform> query;
for( auto [ transform ] : query ) {}


// Take the entities Position, Rotation and Scale, if one of those change.
Query<Any<Changed<Position>, Changed<Rotation>, Changed<Scale>>> query;
for( auto [ position, rotation, scale ] : query ) {}


// Take the enemies and its team.
Query<Enemy, Join<TeamA, TeamB, TeamC>> query;
for( auto [ enemy, team ] : query ) {}


// Take the enemies whom name OR team changed
Query<Enemy, Any<Changed<Name>, Join<Changed<TeamA>, Changed<TeamB>, Changed<TeamC>>> query;
for( auto [ enemy, name, team ] : query ) {}


// Take the player, if its health didn't change.
Query<Player, Not<Changed<Health>>> query;
for( auto [ player, health ] : query ) {}


// Take the Speedups assigned to the character if changed.
Query<Character, Batch<Changed<Speedup>>> query;
for( auto [ charcter, speedups ] : query ) {}


// Take all the EntityID for the crates.
Query<EntityID, Crate> query;
for( auto [ entity, crate ] : query ) {}

[AndreaCatania]

Wiki updated: https://github.com/GodotECS/godex/wiki/Query