Refactor CMakeLists and GitLab CI/CD pipeline

- Remove nested minimum required to supress warnings.
- Declare SystemC as system library to supress warnings in headers.
- Add a BUILD_SHARED_LIBS option
- Remove hardcoded STATIC in various add_library calls to honor the
  BUILD_SHARED_LIBS option
- Remove _deps/ directory from the build directory in GitLab pipeline
- Remove *.tdb files after test stage in pipeline
- Set Ninja as the default generator for the dev preset and re-enable
  colored diagnostics

CMakePresets.json

@@ -62,7 +62,7 @@
         },
         {
             "name": "dev",
-            "generator": "Unix Makefiles",
+            "generator": "Ninja",
             "binaryDir": "${sourceDir}/build",
             "inherits": [
                 "dev-mode",
@@ -70,8 +70,8 @@
             ],
             "cacheVariables": {
                 "CMAKE_BUILD_TYPE": "Debug",
-                "CMAKE_CXX_FLAGS": "-Wall -Wextra -Wpedantic"
+                "CMAKE_CXX_FLAGS": "-Wall -Wextra -Wpedantic -fdiagnostics-color=always"
             }
         }
     ]
-}
+}