Added CI script, updated dependencies, and fixed bugs

-Added CI yaml file for workflows
-Added `doctest` as dependency
-Added test target executable to CMakeLists.txt
-Renamed `bin` scripts to remove `gdpm*` prefix
-Updated `SQLite 3` dependency in CMakeLists.txt
-Implement basic unit testing in `tests/basic.cpp`
-Fixed issue with handling `fmt` strings

bin/compile.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Run this script at project root
+#meson configure build
+#CXX=clang++ meson compile -C build -j$(proc)
+
+
+
+# CMake/ninja build system
+mkdir -p build
+cmake -B build -S . -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -G Ninja
+ninja -C build
+
+# Create symlinks to executables in build folder if necessary
+ln -s ../build/gdpm bin/gdpm
+ln -s ../build/gdpm-tests bin/gdpm-tests