symisc/unqlite

📋 Changes

• Simplified the internal `SyMemBackend` pool path. `SyMemBackendPoolAlloc()` and `SyMemBackendPoolFree()` now route through the standard backend allocator/free path rather than the bucket-pool allocator.
• Removed pool-only allocator machinery, including pool macros, pool header structures, pool-only helper functions, and stale pool realloc declarations.
• Updated the project README to reflect the current site and embedding workflow. The new README documents the amalgamation-first integration path, sample programs, official documentation links, and working GCC/MSVC build examples.
• Modernized the root CMake project for current CMake and Visual Studio toolchains. The top-level build now requires CMake 3.10, declares C as the project language, and uses cleaner option/conditional handling.
• Updated root test/sample wiring to prefer `samples/` when present while still supporting older checkouts using `example/`.
• Moved official project homepage and documentation links to `https://unqlite.symisc.net/`.
• Configuration failure with newer CMake releases that no longer support compatibility modes below CMake 3.5.
• Static zero-initializers that assumed removed pool bookkeeping fields were present.
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