Thread pool of configurable size

[dvmorozov]

Solution

1. Goal is to improve performance of "brute force" search with parallel computing. ✔️
2. The approach should be very similar to implemented with using of TRunner instance and is used inside loop. ✔️
3. PointCloud should be attribute of "handler", because now different instances of handler should work with different data (rotated by different angles). ✔️
4. TRunnerPool class should be designed maintaining pool of instances of TRunner class and having GetRunner method, which should wait until one of runners will be free. ✔️
5. Initial angles of rotation are stored as attributes of TPointCloud because they are just extra attributes of the same entity (no needs to create additional container). ✔️

Related

#3