Allow virtual type methods for TTL_tiler

[chrisgearing]

Implement virtual type methods for TTL_tiler to support different tiling strategies without requiring code duplication. This enables more flexible and efficient tiling implementations, especially in OpenCL C++ where virtual methods are not directly supported.

Key changes: Used composition and duck-typing to allow different classes (e.g., TTL_tiler and TTL_overlap_tiler) to be used interchangeably.

Improved code optimization by providing more information to the compiler.

Reduced storage requirements by avoiding worst-case storage scenarios.

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