More efficient array creation

[Bond-009]

• Use new collection expressions to concat to existing arrays
• Use Array.ConvertAll where possible
• Replace .ToArray with .ToList where possible

(And yes, collection expressions are as fast/faster than manually creating and copying)

| Method | N    | Mean       | Error     | StdDev    | Gen0   | Allocated |
|------- |----- |-----------:|----------:|----------:|-------:|----------:|
| Magic  | 0    |   9.943 ns | 0.0780 ns | 0.0692 ns | 0.0004 |      32 B |
| Manual | 0    |  14.550 ns | 0.0883 ns | 0.0826 ns | 0.0004 |      32 B |
| Magic  | 1    |  10.365 ns | 0.0529 ns | 0.0494 ns | 0.0004 |      32 B |
| Manual | 1    |  15.433 ns | 0.1458 ns | 0.1364 ns | 0.0004 |      32 B |
| Magic  | 4    |  11.119 ns | 0.0906 ns | 0.0803 ns | 0.0004 |      32 B |
| Manual | 4    |  15.586 ns | 0.1641 ns | 0.1370 ns | 0.0004 |      32 B |
| Magic  | 64   |  15.337 ns | 0.0777 ns | 0.0649 ns | 0.0011 |      96 B |
| Manual | 64   |  20.924 ns | 0.2432 ns | 0.2275 ns | 0.0011 |      96 B |
| Magic  | 512  |  53.652 ns | 0.5195 ns | 0.4860 ns | 0.0065 |     544 B |
| Manual | 512  |  58.823 ns | 0.4412 ns | 0.3911 ns | 0.0064 |     544 B |
| Magic  | 2048 | 187.799 ns | 2.6503 ns | 2.4791 ns | 0.0248 |    2080 B |
| Manual | 2048 | 197.916 ns | 1.4985 ns | 1.4017 ns | 0.0248 |    2080 B |